diff --git a/Cargo.lock b/Cargo.lock
index eb3fba54..77ac158d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -41,7 +41,7 @@ name = "atty"
 version = "0.2.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -59,8 +59,8 @@ dependencies = [
  "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "backtrace-sys 0.1.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc-demangle 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rustc-demangle 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -70,7 +70,7 @@ version = "0.1.28"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -103,7 +103,7 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bzip2-sys 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -112,7 +112,7 @@ version = "0.1.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -122,9 +122,9 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "error-chain 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -137,16 +137,6 @@ name = "cfg-if"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "chrono"
-version = "0.4.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "clap"
 version = "2.32.0"
@@ -168,7 +158,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -179,7 +169,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -199,8 +189,8 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "clicolors-control 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -216,8 +206,8 @@ dependencies = [
  "clicolors-control 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "encode_unicode 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -250,9 +240,9 @@ name = "curl"
 version = "0.4.19"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "curl-sys 0.4.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl-sys 0.4.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "schannel 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -262,11 +252,11 @@ dependencies = [
 
 [[package]]
 name = "curl-sys"
-version = "0.4.15"
+version = "0.4.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "libz-sys 1.0.25 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -289,7 +279,7 @@ name = "dirs"
 version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_users 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -299,6 +289,17 @@ name = "encode_unicode"
 version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "env_logger"
+version = "0.5.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "error-chain"
 version = "0.12.0"
@@ -309,21 +310,21 @@ dependencies = [
 
 [[package]]
 name = "failure"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure_derive 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "failure_derive"
-version = "0.1.3"
+version = "0.1.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -333,8 +334,8 @@ version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -343,7 +344,7 @@ version = "1.0.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "crc32fast 1.1.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz-sys 0.1.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide_c_api 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -399,10 +400,10 @@ version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "backtrace 0.3.13 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "os_type 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -410,25 +411,22 @@ dependencies = [
 ]
 
 [[package]]
-name = "indicatif"
-version = "0.9.0"
+name = "humantime"
+version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "console 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "parking_lot 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quick-error 1.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "isatty"
-version = "0.1.9"
+name = "indicatif"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "console 0.7.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "lazy_static 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking_lot 0.7.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "regex 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -457,7 +455,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "libc"
-version = "0.2.45"
+version = "0.2.46"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -476,7 +474,7 @@ version = "1.0.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -490,13 +488,21 @@ dependencies = [
  "scopeguard 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "log"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "memchr"
 version = "2.1.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "version_check 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -506,7 +512,7 @@ version = "0.1.11"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -524,7 +530,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
  "crc 1.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "miniz_oxide 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -533,19 +539,6 @@ name = "nodrop"
 version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "num-integer"
-version = "0.1.39"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "num-traits"
-version = "0.2.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "openssl"
 version = "0.10.16"
@@ -555,7 +548,7 @@ dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "foreign-types 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-sys 0.9.40 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -578,7 +571,7 @@ version = "0.9.40"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cc 1.0.28 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl-src 111.1.0+1.1.1a (registry+https://github.com/rust-lang/crates.io-index)",
  "pkg-config 0.3.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "vcpkg 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -611,7 +604,7 @@ dependencies = [
 
 [[package]]
 name = "parking_lot"
-version = "0.7.0"
+version = "0.7.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "lock_api 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -623,7 +616,7 @@ name = "parking_lot_core"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.5.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -635,8 +628,8 @@ name = "parking_lot_core"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -660,6 +653,11 @@ dependencies = [
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
 name = "quote"
 version = "0.6.10"
@@ -674,17 +672,19 @@ version = "0.3.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.4.3"
+version = "0.4.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -695,36 +695,35 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand"
-version = "0.6.1"
+version = "0.6.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_chacha 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_chacha 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_hc 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_isaac 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_os 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_pcg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand_xorshift 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_xorshift 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "rand_chacha"
-version = "0.1.0"
+version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
+ "autocfg 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "rustc_version 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -756,6 +755,19 @@ dependencies = [
  "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "rand_os"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cloudabi 0.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rdrand 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "rand_pcg"
 version = "0.1.1"
@@ -767,7 +779,15 @@ dependencies = [
 
 [[package]]
 name = "rand_xorshift"
-version = "0.1.0"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "rdrand"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "rand_core 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -775,7 +795,7 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.1.44"
+version = "0.1.50"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -783,7 +803,7 @@ name = "redox_termios"
 version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -792,9 +812,9 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "argon2rs 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -847,7 +867,7 @@ dependencies = [
 
 [[package]]
 name = "rustc-demangle"
-version = "0.1.11"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -896,7 +916,7 @@ version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "semver-parser 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -906,17 +926,17 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.83"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde_derive"
-version = "1.0.83"
+version = "1.0.84"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -924,17 +944,17 @@ name = "serde_ignored"
 version = "0.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "serde_json"
-version = "1.0.33"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "itoa 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "ryu 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -942,33 +962,6 @@ name = "siphasher"
 version = "0.2.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
-[[package]]
-name = "slog"
-version = "2.4.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
-[[package]]
-name = "slog-async"
-version = "2.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
-[[package]]
-name = "slog-term"
-version = "2.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-dependencies = [
- "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "isatty 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
-]
-
 [[package]]
 name = "smallvec"
 version = "0.6.7"
@@ -983,8 +976,8 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1020,12 +1013,12 @@ dependencies = [
  "heck 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "syn"
-version = "0.15.23"
+version = "0.15.24"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1040,23 +1033,18 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "proc-macro2 0.4.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "quote 0.6.10 (registry+https://github.com/rust-lang/crates.io-index)",
- "syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)",
+ "syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)",
  "unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
-[[package]]
-name = "take_mut"
-version = "0.2.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-
 [[package]]
 name = "tar"
 version = "0.4.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "filetime 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1065,7 +1053,7 @@ name = "tempdir"
 version = "0.3.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1075,9 +1063,9 @@ version = "2.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "kernel32-sys 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
  "rand 0.3.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1087,28 +1075,27 @@ version = "3.0.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "remove_dir_all 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
-name = "term"
-version = "0.5.1"
+name = "termcolor"
+version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "byteorder 1.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
- "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "termcolor"
-version = "0.3.6"
+version = "1.0.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1116,8 +1103,8 @@ name = "termion"
 version = "1.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "redox_termios 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1126,7 +1113,7 @@ name = "termios"
 version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1147,11 +1134,11 @@ dependencies = [
 
 [[package]]
 name = "time"
-version = "0.1.41"
+version = "0.1.42"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
- "redox_syscall 0.1.44 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
+ "redox_syscall 0.1.50 (registry+https://github.com/rust-lang/crates.io-index)",
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -1160,7 +1147,7 @@ name = "toml"
 version = "0.4.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1202,7 +1189,7 @@ version = "0.6.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "cfg-if 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "rand 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rand 0.4.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1242,21 +1229,23 @@ dependencies = [
  "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "cargo_metadata 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "console 0.6.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "dialoguer 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "env_logger 0.5.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "glob 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
  "human-panic 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "indicatif 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "openssl 0.10.16 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.6.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_derive 1.0.83 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_derive 1.0.84 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_ignored 0.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "serde_json 1.0.33 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "slog-term 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.34 (registry+https://github.com/rust-lang/crates.io-index)",
+ "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)",
  "tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1272,7 +1261,7 @@ version = "0.1.0"
 dependencies = [
  "curl 0.4.19 (registry+https://github.com/rust-lang/crates.io-index)",
  "dirs 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "flate2 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "siphasher 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1285,8 +1274,8 @@ name = "which"
 version = "2.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "failure 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "libc 0.2.45 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.46 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1334,12 +1323,21 @@ dependencies = [
  "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
+[[package]]
+name = "wincolor"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "xattr"
 version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
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 [[package]]
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-"checksum slog 2.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "1e1a2eec401952cd7b12a84ea120e2d57281329940c3f93c2bf04f462539508e"
-"checksum slog-async 2.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "e544d16c6b230d84c866662fe55e31aacfca6ae71e6fc49ae9a311cb379bfc2f"
-"checksum slog-term 2.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "5951a808c40f419922ee014c15b6ae1cd34d963538b57d8a4778b9ca3fff1e0b"
 "checksum smallvec 0.6.7 (registry+https://github.com/rust-lang/crates.io-index)" = "b73ea3738b47563803ef814925e69be00799a8c07420be8b996f8e98fb2336db"
 "checksum socket2 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "c4d11a52082057d87cb5caa31ad812f4504b97ab44732cd8359df2e9ff9f48e7"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
@@ -1475,20 +1472,19 @@ dependencies = [
 "checksum strsim 0.8.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
 "checksum structopt 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "670ad348dc73012fcf78c71f06f9d942232cdd4c859d4b6975e27836c3efc0c3"
 "checksum structopt-derive 0.2.14 (registry+https://github.com/rust-lang/crates.io-index)" = "ef98172b1a00b0bec738508d3726540edcbd186d50dfd326f2b1febbb3559f04"
-"checksum syn 0.15.23 (registry+https://github.com/rust-lang/crates.io-index)" = "9545a6a093a3f0bd59adb472700acc08cad3776f860f16a897dfce8c88721cbc"
+"checksum syn 0.15.24 (registry+https://github.com/rust-lang/crates.io-index)" = "734ecc29cd36e8123850d9bf21dfd62ef8300aaa8f879aabaa899721808be37c"
 "checksum synstructure 0.10.1 (registry+https://github.com/rust-lang/crates.io-index)" = "73687139bf99285483c96ac0add482c3776528beac1d97d444f6e91f203a2015"
-"checksum take_mut 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f764005d11ee5f36500a149ace24e00e3da98b0158b3e2d53a7495660d3f4d60"
 "checksum tar 0.4.20 (registry+https://github.com/rust-lang/crates.io-index)" = "a303ba60a099fcd2aaa646b14d2724591a96a75283e4b7ed3d1a1658909d9ae2"
 "checksum tempdir 0.3.7 (registry+https://github.com/rust-lang/crates.io-index)" = "15f2b5fb00ccdf689e0149d1b1b3c03fead81c2b37735d812fa8bddbbf41b6d8"
 "checksum tempfile 2.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "11ce2fe9db64b842314052e2421ac61a73ce41b898dc8e3750398b219c5fc1e0"
 "checksum tempfile 3.0.5 (registry+https://github.com/rust-lang/crates.io-index)" = "7e91405c14320e5c79b3d148e1c86f40749a36e490642202a31689cb1a3452b2"
-"checksum term 0.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5e6b677dd1e8214ea1ef4297f85dbcbed8e8cdddb561040cc998ca2551c37561"
 "checksum termcolor 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "adc4587ead41bf016f11af03e55a624c06568b5a19db4e90fde573d805074f83"
+"checksum termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
 "checksum termios 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "72b620c5ea021d75a735c943269bb07d30c9b77d6ac6b236bc8b5c496ef05625"
 "checksum textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "307686869c93e71f94da64286f9a9524c0f308a9e1c87a583de8e9c9039ad3f6"
 "checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
-"checksum time 0.1.41 (registry+https://github.com/rust-lang/crates.io-index)" = "847da467bf0db05882a9e2375934a8a55cffdc9db0d128af1518200260ba1f6c"
+"checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
 "checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
 "checksum unicode-segmentation 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "aa6024fc12ddfd1c6dbc14a80fa2324d4568849869b779f6bd37e5e4c03344d1"
@@ -1510,5 +1506,6 @@ dependencies = [
 "checksum winapi-util 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "afc5508759c5bf4285e61feb862b6083c8480aec864fa17a81fdec6f69b461ab"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
 "checksum wincolor 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "eeb06499a3a4d44302791052df005d5232b927ed1a9658146d842165c4de7767"
+"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
 "checksum xattr 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "244c3741f4240ef46274860397c7c74e50eb23624996930e484c16679633a54c"
 "checksum zip 0.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "00acf1fafb786ff450b6726e5be41ef029142597b47a40ce80f952f1471730a0"
diff --git a/Cargo.toml b/Cargo.toml
index dcf45e96..69b21b37 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,21 +14,23 @@ atty = "0.2.11"
 cargo_metadata = "0.6.0"
 console = "0.6.1"
 dialoguer = "0.3.0"
+curl = "0.4.13"
+dirs = "1.0.4"
+env_logger = { version = "0.5.13", default-features = false }
 failure = "0.1.2"
 human-panic = "1.0.1"
 glob = "0.2"
 indicatif = "0.9.0"
 lazy_static = "1.1.0"
+log = "0.4.6"
 openssl = { version = '0.10.11', optional = true }
 parking_lot = "0.6"
 serde = "1.0.74"
 serde_derive = "1.0.74"
 serde_ignored = "0.0.4"
 serde_json = "1.0.26"
-slog = "2.3"
-slog-term = "2.4"
-slog-async = "2.3"
 strsim = "0.8.0"
+siphasher = "0.2.3"
 structopt = "0.2"
 toml = "0.4"
 which = "2.0.0"
diff --git a/src/bindgen.rs b/src/bindgen.rs
index 0a849506..c2ad7b25 100644
--- a/src/bindgen.rs
+++ b/src/bindgen.rs
@@ -4,9 +4,10 @@ use child;
 use command::build::BuildProfile;
 use emoji;
 use failure::{self, ResultExt};
+use log::debug;
+use log::{info, warn};
 use manifest::CrateData;
 use progressbar::Step;
-use slog::Logger;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::Command;
@@ -26,7 +27,6 @@ pub fn install_wasm_bindgen(
     version: &str,
     install_permitted: bool,
     step: &Step,
-    log: &Logger,
 ) -> Result<Download, failure::Error> {
     // If `wasm-bindgen` is installed globally and it has the right version, use
     // that. Assume that other tools are installed next to it.
@@ -34,12 +34,8 @@ pub fn install_wasm_bindgen(
     // This situation can arise if `wasm-bindgen` is already installed via
     // `cargo install`, for example.
     if let Ok(path) = which("wasm-bindgen") {
-        debug!(
-            log,
-            "found global wasm-bindgen binary at: {}",
-            path.display()
-        );
-        if wasm_bindgen_version_check(&path, version, log) {
+        debug!("found global wasm-bindgen binary at: {}", path.display());
+        if wasm_bindgen_version_check(&path, version) {
             return Ok(Download::at(path.parent().unwrap()));
         }
     }
@@ -52,14 +48,13 @@ pub fn install_wasm_bindgen(
         Ok(dl) => return Ok(dl),
         Err(e) => {
             warn!(
-                log,
                 "could not download pre-built `wasm-bindgen`: {}. Falling back to `cargo install`.",
                 e
             );
         }
     }
 
-    cargo_install_wasm_bindgen(log, &cache, version, install_permitted)
+    cargo_install_wasm_bindgen(&cache, version, install_permitted)
 }
 
 /// Downloads a precompiled copy of wasm-bindgen, if available.
@@ -102,7 +97,6 @@ fn prebuilt_url(version: &str) -> Option<String> {
 /// Use `cargo install` to install the `wasm-bindgen` CLI locally into the given
 /// crate.
 pub fn cargo_install_wasm_bindgen(
-    logger: &Logger,
     cache: &Cache,
     version: &str,
     install_permitted: bool,
@@ -132,7 +126,7 @@ pub fn cargo_install_wasm_bindgen(
         .arg("--root")
         .arg(&tmp);
 
-    child::run(logger, cmd, "cargo install").context("Installing wasm-bindgen with cargo")?;
+    child::run(cmd, "cargo install").context("Installing wasm-bindgen with cargo")?;
 
     fs::rename(&tmp, &destination)?;
     Ok(Download::at(&destination))
@@ -148,7 +142,6 @@ pub fn wasm_bindgen_build(
     target: &str,
     profile: BuildProfile,
     step: &Step,
-    log: &Logger,
 ) -> Result<(), failure::Error> {
     let msg = format!("{}Running WASM-bindgen...", emoji::RUNNER);
     PBAR.step(step, &msg);
@@ -196,15 +189,15 @@ pub fn wasm_bindgen_build(
         cmd.arg("--keep-debug");
     }
 
-    child::run(log, cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
+    child::run(cmd, "wasm-bindgen").context("Running the wasm-bindgen CLI")?;
     Ok(())
 }
 
 /// Check if the `wasm-bindgen` dependency is locally satisfied.
-fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str, log: &Logger) -> bool {
+fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str) -> bool {
     let mut cmd = Command::new(bindgen_path);
     cmd.arg("--version");
-    child::run(log, cmd, "wasm-bindgen")
+    child::run(cmd, "wasm-bindgen")
         .map(|stdout| {
             stdout
                 .trim()
@@ -212,10 +205,8 @@ fn wasm_bindgen_version_check(bindgen_path: &PathBuf, dep_version: &str, log: &L
                 .nth(1)
                 .map(|v| {
                     info!(
-                        log,
                         "Checking installed `wasm-bindgen` version == expected version: {} == {}",
-                        v,
-                        dep_version
+                        v, dep_version
                     );
                     v == dep_version
                 })
diff --git a/src/build.rs b/src/build.rs
index 4628d37c..e240c436 100644
--- a/src/build.rs
+++ b/src/build.rs
@@ -5,7 +5,6 @@ use command::build::BuildProfile;
 use emoji;
 use failure::{Error, ResultExt};
 use progressbar::Step;
-use slog::Logger;
 use std::path::Path;
 use std::process::Command;
 use std::str;
@@ -52,23 +51,17 @@ fn rustc_minor_version() -> Option<u32> {
 
 /// Ensure that `rustup` has the `wasm32-unknown-unknown` target installed for
 /// current toolchain
-pub fn rustup_add_wasm_target(log: &Logger, step: &Step) -> Result<(), Error> {
+pub fn rustup_add_wasm_target(step: &Step) -> Result<(), Error> {
     let msg = format!("{}Adding WASM target...", emoji::TARGET);
     PBAR.step(step, &msg);
     let mut cmd = Command::new("rustup");
     cmd.arg("target").arg("add").arg("wasm32-unknown-unknown");
-    child::run(log, cmd, "rustup")
-        .context("Adding the wasm32-unknown-unknown target with rustup")?;
+    child::run(cmd, "rustup").context("Adding the wasm32-unknown-unknown target with rustup")?;
     Ok(())
 }
 
 /// Run `cargo build` targetting `wasm32-unknown-unknown`.
-pub fn cargo_build_wasm(
-    log: &Logger,
-    path: &Path,
-    profile: BuildProfile,
-    step: &Step,
-) -> Result<(), Error> {
+pub fn cargo_build_wasm(path: &Path, profile: BuildProfile, step: &Step) -> Result<(), Error> {
     let msg = format!("{}Compiling to WASM...", emoji::CYCLONE);
     PBAR.step(step, &msg);
     let mut cmd = Command::new("cargo");
@@ -91,18 +84,18 @@ pub fn cargo_build_wasm(
         }
     }
     cmd.arg("--target").arg("wasm32-unknown-unknown");
-    child::run(log, cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
+    child::run(cmd, "cargo build").context("Compiling your crate to WebAssembly failed")?;
     Ok(())
 }
 
 /// Run `cargo build --tests` targetting `wasm32-unknown-unknown`.
-pub fn cargo_build_wasm_tests(log: &Logger, path: &Path, debug: bool) -> Result<(), Error> {
+pub fn cargo_build_wasm_tests(path: &Path, debug: bool) -> Result<(), Error> {
     let mut cmd = Command::new("cargo");
     cmd.current_dir(path).arg("build").arg("--tests");
     if !debug {
         cmd.arg("--release");
     }
     cmd.arg("--target").arg("wasm32-unknown-unknown");
-    child::run(log, cmd, "cargo build").context("Compilation of your program failed")?;
+    child::run(cmd, "cargo build").context("Compilation of your program failed")?;
     Ok(())
 }
diff --git a/src/child.rs b/src/child.rs
index e312c205..9aaf0170 100644
--- a/src/child.rs
+++ b/src/child.rs
@@ -4,7 +4,7 @@
 //! properly logged and their output is logged as well.
 
 use failure::Error;
-use slog::Logger;
+use log::info;
 use std::{
     io::{self, Read},
     mem, process, string,
@@ -115,12 +115,8 @@ where
 }
 
 /// Run the given command and return its stdout.
-pub fn run(
-    logger: &Logger,
-    mut command: process::Command,
-    command_name: &str,
-) -> Result<String, Error> {
-    info!(logger, "Running {:?}", command);
+pub fn run(mut command: process::Command, command_name: &str) -> Result<String, Error> {
+    info!("Running {:?}", command);
 
     let mut child = command
         .stdout(process::Stdio::piped())
@@ -144,11 +140,11 @@ pub fn run(
         thread::spawn(move || read_and_send(stderr, stderr_send, OutputFragment::Stderr));
 
     let mut stdout = OutputAccumulator::new(|line| {
-        info!(logger, "{} (stdout): {}", command_name, line);
+        info!("{} (stdout): {}", command_name, line);
         PBAR.message(line)
     });
     let mut stderr = OutputAccumulator::new(|line| {
-        info!(logger, "{} (stderr): {}", command_name, line);
+        info!("{} (stderr): {}", command_name, line);
         PBAR.message(line)
     });
 
diff --git a/src/command/build.rs b/src/command/build.rs
index 0fbbff3e..86c467c6 100644
--- a/src/command/build.rs
+++ b/src/command/build.rs
@@ -8,10 +8,10 @@ use failure::Error;
 use indicatif::HumanDuration;
 use license;
 use lockfile::Lockfile;
+use log::info;
 use manifest;
 use progressbar::Step;
 use readme;
-use slog::Logger;
 use std::path::PathBuf;
 use std::str::FromStr;
 use std::time::Instant;
@@ -139,7 +139,7 @@ impl Default for BuildOptions {
     }
 }
 
-type BuildStep = fn(&mut Build, &Step, &Logger) -> Result<(), Error>;
+type BuildStep = fn(&mut Build, &Step) -> Result<(), Error>;
 
 impl Build {
     /// Construct a build command from the given options.
@@ -178,7 +178,7 @@ impl Build {
     }
 
     /// Execute this `Build` command.
-    pub fn run(&mut self, log: &Logger) -> Result<(), Error> {
+    pub fn run(&mut self) -> Result<(), Error> {
         let process_steps = Build::get_process_steps(&self.mode);
 
         let mut step_counter = Step::new(process_steps.len());
@@ -186,14 +186,13 @@ impl Build {
         let started = Instant::now();
 
         for (_, process_step) in process_steps {
-            process_step(self, &step_counter, log)?;
+            process_step(self, &step_counter)?;
             step_counter.inc();
         }
 
         let duration = HumanDuration(started.elapsed());
-        info!(&log, "Done in {}.", &duration);
+        info!("Done in {}.", &duration);
         info!(
-            &log,
             "Your wasm pkg is ready to publish at {}.",
             self.out_dir.display()
         );
@@ -253,34 +252,33 @@ impl Build {
         }
     }
 
-    fn step_check_rustc_version(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Checking rustc version...");
+    fn step_check_rustc_version(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking rustc version...");
         let version = build::check_rustc_version(step)?;
         let msg = format!("rustc version is {}.", version);
-        info!(&log, "{}", &msg);
+        info!("{}", &msg);
         Ok(())
     }
 
-    fn step_check_crate_config(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Checking crate configuration...");
+    fn step_check_crate_config(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking crate configuration...");
         self.crate_data.check_crate_config(step)?;
-        info!(&log, "Crate is correctly configured.");
+        info!("Crate is correctly configured.");
         Ok(())
     }
 
-    fn step_add_wasm_target(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Adding wasm-target...");
-        build::rustup_add_wasm_target(log, step)?;
-        info!(&log, "Adding wasm-target was successful.");
+    fn step_add_wasm_target(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Adding wasm-target...");
+        build::rustup_add_wasm_target(step)?;
+        info!("Adding wasm-target was successful.");
         Ok(())
     }
 
-    fn step_build_wasm(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Building wasm...");
-        build::cargo_build_wasm(log, &self.crate_path, self.profile, step)?;
+    fn step_build_wasm(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Building wasm...");
+        build::cargo_build_wasm(&self.crate_path, self.profile, step)?;
 
         info!(
-            &log,
             "wasm built at {:#?}.",
             &self
                 .crate_path
@@ -291,15 +289,15 @@ impl Build {
         Ok(())
     }
 
-    fn step_create_dir(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Creating a pkg directory...");
+    fn step_create_dir(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Creating a pkg directory...");
         create_pkg_dir(&self.out_dir, step)?;
-        info!(&log, "Created a pkg directory at {:#?}.", &self.crate_path);
+        info!("Created a pkg directory at {:#?}.", &self.crate_path);
         Ok(())
     }
 
-    fn step_create_json(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Writing a package.json...");
+    fn step_create_json(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Writing a package.json...");
         self.crate_data.write_package_json(
             &self.out_dir,
             &self.scope,
@@ -308,55 +306,45 @@ impl Build {
             step,
         )?;
         info!(
-            &log,
             "Wrote a package.json at {:#?}.",
             &self.out_dir.join("package.json")
         );
         Ok(())
     }
 
-    fn step_copy_readme(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Copying readme from crate...");
+    fn step_copy_readme(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Copying readme from crate...");
         readme::copy_from_crate(&self.crate_path, &self.out_dir, step)?;
-        info!(&log, "Copied readme from crate to {:#?}.", &self.out_dir);
+        info!("Copied readme from crate to {:#?}.", &self.out_dir);
         Ok(())
     }
 
-    fn step_copy_license(&mut self, step: &Step, log: &Logger) -> Result<(), failure::Error> {
-        info!(&log, "Copying license from crate...");
+    fn step_copy_license(&mut self, step: &Step) -> Result<(), failure::Error> {
+        info!("Copying license from crate...");
         license::copy_from_crate(&self.crate_data, &self.crate_path, &self.out_dir, step)?;
-        info!(&log, "Copied license from crate to {:#?}.", &self.out_dir);
+        info!("Copied license from crate to {:#?}.", &self.out_dir);
         Ok(())
     }
 
-    fn step_install_wasm_bindgen(
-        &mut self,
-        step: &Step,
-        log: &Logger,
-    ) -> Result<(), failure::Error> {
-        info!(&log, "Identifying wasm-bindgen dependency...");
+    fn step_install_wasm_bindgen(&mut self, step: &Step) -> Result<(), failure::Error> {
+        info!("Identifying wasm-bindgen dependency...");
         let lockfile = Lockfile::new(&self.crate_data)?;
         let bindgen_version = lockfile.require_wasm_bindgen()?;
-        info!(&log, "Installing wasm-bindgen-cli...");
+        info!("Installing wasm-bindgen-cli...");
         let install_permitted = match self.mode {
             BuildMode::Normal => true,
             BuildMode::Force => true,
             BuildMode::Noinstall => false,
         };
-        let bindgen = bindgen::install_wasm_bindgen(
-            &self.cache,
-            &bindgen_version,
-            install_permitted,
-            step,
-            log,
-        )?;
+        let bindgen =
+            bindgen::install_wasm_bindgen(&self.cache, &bindgen_version, install_permitted, step)?;
         self.bindgen = Some(bindgen);
-        info!(&log, "Installing wasm-bindgen-cli was successful.");
+        info!("Installing wasm-bindgen-cli was successful.");
         Ok(())
     }
 
-    fn step_run_wasm_bindgen(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Building the wasm bindings...");
+    fn step_run_wasm_bindgen(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Building the wasm bindings...");
         bindgen::wasm_bindgen_build(
             &self.crate_data,
             self.bindgen.as_ref().unwrap(),
@@ -365,9 +353,8 @@ impl Build {
             &self.target,
             self.profile,
             step,
-            log,
         )?;
-        info!(&log, "wasm bindings were built at {:#?}.", &self.out_dir);
+        info!("wasm bindings were built at {:#?}.", &self.out_dir);
         Ok(())
     }
 }
diff --git a/src/command/login.rs b/src/command/login.rs
index a660cb9e..0ee09c3d 100644
--- a/src/command/login.rs
+++ b/src/command/login.rs
@@ -1,5 +1,5 @@
+use log::info;
 use npm;
-use slog::Logger;
 use std::result;
 use PBAR;
 
@@ -8,22 +8,17 @@ pub fn login(
     scope: Option<String>,
     always_auth: bool,
     auth_type: Option<String>,
-    log: &Logger,
 ) -> result::Result<(), failure::Error> {
     let registry = registry.unwrap_or(npm::DEFAULT_NPM_REGISTRY.to_string());
 
-    info!(&log, "Logging in to npm...");
+    info!("Logging in to npm...");
     info!(
-        &log,
         "Scope: {:?} Registry: {}, Always Auth: {}, Auth Type: {:?}.",
-        &scope,
-        &registry,
-        always_auth,
-        &auth_type
+        &scope, &registry, always_auth, &auth_type
     );
-    info!(&log, "npm info located in the npm debug log");
-    npm::npm_login(log, &registry, &scope, always_auth, &auth_type)?;
-    info!(&log, "Logged you in!");
+    info!("npm info located in the npm debug log");
+    npm::npm_login(&registry, &scope, always_auth, &auth_type)?;
+    info!("Logged you in!");
 
     PBAR.message(&format!("👋  logged you in!"));
     Ok(())
diff --git a/src/command/mod.rs b/src/command/mod.rs
index 06353ec1..86a8235b 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -14,7 +14,7 @@ use self::pack::pack;
 use self::publish::{access::Access, publish};
 use self::test::{Test, TestOptions};
 use failure::Error;
-use slog::Logger;
+use log::info;
 use std::path::PathBuf;
 use std::result;
 
@@ -87,27 +87,27 @@ pub enum Command {
 }
 
 /// Run a command with the given logger!
-pub fn run_wasm_pack(command: Command, log: &Logger) -> result::Result<(), Error> {
+pub fn run_wasm_pack(command: Command) -> result::Result<(), Error> {
     // Run the correct command based off input and store the result of it so that we can clear
     // the progress bar then return it
     let status = match command {
         Command::Build(build_opts) => {
-            info!(&log, "Running build command...");
-            Build::try_from_opts(build_opts).and_then(|mut b| b.run(&log))
+            info!("Running build command...");
+            Build::try_from_opts(build_opts).and_then(|mut b| b.run())
         }
         Command::Pack { path } => {
-            info!(&log, "Running pack command...");
-            info!(&log, "Path: {:?}", &path);
-            pack(path, &log)
+            info!("Running pack command...");
+            info!("Path: {:?}", &path);
+            pack(path)
         }
         Command::Publish {
             target,
             path,
             access,
         } => {
-            info!(&log, "Running publish command...");
-            info!(&log, "Path: {:?}", &path);
-            publish(target, path, access, &log)
+            info!("Running publish command...");
+            info!("Path: {:?}", &path);
+            publish(target, path, access)
         }
         Command::Login {
             registry,
@@ -115,20 +115,16 @@ pub fn run_wasm_pack(command: Command, log: &Logger) -> result::Result<(), Error
             always_auth,
             auth_type,
         } => {
-            info!(&log, "Running login command...");
+            info!("Running login command...");
             info!(
-                &log,
                 "Registry: {:?}, Scope: {:?}, Always Auth: {}, Auth Type: {:?}",
-                &registry,
-                &scope,
-                &always_auth,
-                &auth_type
+                &registry, &scope, &always_auth, &auth_type
             );
-            login(registry, scope, always_auth, auth_type, &log)
+            login(registry, scope, always_auth, auth_type)
         }
         Command::Test(test_opts) => {
-            info!(&log, "Running test command...");
-            Test::try_from_opts(test_opts).and_then(|t| t.run(&log))
+            info!("Running test command...");
+            Test::try_from_opts(test_opts).and_then(|t| t.run())
         }
     };
 
diff --git a/src/command/pack.rs b/src/command/pack.rs
index d9f70550..5ede6024 100644
--- a/src/command/pack.rs
+++ b/src/command/pack.rs
@@ -1,17 +1,17 @@
 use command::utils::{find_pkg_directory, set_crate_path};
 use failure::Error;
+use log::info;
 use npm;
-use slog::Logger;
 use std::path::PathBuf;
 use std::result;
 use PBAR;
 
 /// Executes the 'npm pack' command on the 'pkg' directory
 /// which creates a tarball that can be published to the NPM registry
-pub fn pack(path: Option<PathBuf>, log: &Logger) -> result::Result<(), Error> {
+pub fn pack(path: Option<PathBuf>) -> result::Result<(), Error> {
     let crate_path = set_crate_path(path)?;
 
-    info!(&log, "Packing up the npm package...");
+    info!("Packing up the npm package...");
     let pkg_directory = find_pkg_directory(&crate_path).ok_or_else(|| {
         format_err!(
             "Unable to find the pkg directory at path {:#?}, or in a child directory of {:#?}",
@@ -19,12 +19,8 @@ pub fn pack(path: Option<PathBuf>, log: &Logger) -> result::Result<(), Error> {
             &crate_path
         )
     })?;
-    npm::npm_pack(log, &pkg_directory.to_string_lossy())?;
-    info!(
-        &log,
-        "Your package is located at {:#?}",
-        crate_path.join("pkg")
-    );
+    npm::npm_pack(&pkg_directory.to_string_lossy())?;
+    info!("Your package is located at {:#?}", crate_path.join("pkg"));
 
     PBAR.message("🎒  packed up your package!");
     Ok(())
diff --git a/src/command/publish/mod.rs b/src/command/publish/mod.rs
index b2c0916d..568104b4 100644
--- a/src/command/publish/mod.rs
+++ b/src/command/publish/mod.rs
@@ -6,8 +6,8 @@ use command::build::{Build, BuildOptions};
 use command::utils::{find_pkg_directory, set_crate_path};
 use dialoguer::{Confirmation, Input, Select};
 use failure::Error;
+use log::info;
 use npm;
-use slog::Logger;
 use std::path::PathBuf;
 use std::result;
 use PBAR;
@@ -18,12 +18,11 @@ pub fn publish(
     _target: String,
     path: Option<PathBuf>,
     access: Option<Access>,
-    log: &Logger,
 ) -> result::Result<(), Error> {
     let crate_path = set_crate_path(path)?;
 
-    info!(&log, "Publishing the npm package...");
-    info!(&log, "npm info located in the npm debug log");
+    info!("Publishing the npm package...");
+    info!("npm info located in the npm debug log");
 
     let pkg_directory = match find_pkg_directory(&crate_path) {
         Some(path) => Ok(path),
@@ -53,7 +52,7 @@ pub fn publish(
                     ..Default::default()
                 };
                 Build::try_from_opts(build_opts)
-                    .and_then(|mut build| build.run(&log))
+                    .and_then(|mut build| build.run())
                     .map(|()| crate_path.join(out_dir))
                     .map_err(|_| {
                         format_err!(
@@ -73,8 +72,8 @@ pub fn publish(
             }
         }
     }?;
-    npm::npm_publish(log, &pkg_directory.to_string_lossy(), access)?;
-    info!(&log, "Published your package!");
+    npm::npm_publish(&pkg_directory.to_string_lossy(), access)?;
+    info!("Published your package!");
 
     PBAR.message("💥  published your package!");
     Ok(())
diff --git a/src/command/test.rs b/src/command/test.rs
index 81e5c2b5..99c95e2d 100644
--- a/src/command/test.rs
+++ b/src/command/test.rs
@@ -9,9 +9,9 @@ use emoji;
 use failure::Error;
 use indicatif::HumanDuration;
 use lockfile::Lockfile;
+use log::info;
 use manifest;
 use progressbar::Step;
-use slog::Logger;
 use std::path::PathBuf;
 use std::time::Instant;
 use test::{self, webdriver};
@@ -97,7 +97,7 @@ pub struct Test {
     test_runner_path: Option<PathBuf>,
 }
 
-type TestStep = fn(&mut Test, &Step, &Logger) -> Result<(), Error>;
+type TestStep = fn(&mut Test, &Step) -> Result<(), Error>;
 
 impl Test {
     /// Construct a test command from the given options.
@@ -155,17 +155,17 @@ impl Test {
     }
 
     /// Execute this test command.
-    pub fn run(mut self, log: &Logger) -> Result<(), Error> {
+    pub fn run(mut self) -> Result<(), Error> {
         let process_steps = self.get_process_steps();
         let mut step_counter = Step::new(process_steps.len());
 
         let started = Instant::now();
         for (_, process_step) in process_steps {
-            process_step(&mut self, &step_counter, log)?;
+            process_step(&mut self, &step_counter)?;
             step_counter.inc();
         }
         let duration = HumanDuration(started.elapsed());
-        info!(&log, "Done in {}.", &duration);
+        info!("Done in {}.", &duration);
 
         Ok(())
     }
@@ -225,34 +225,34 @@ impl Test {
         }
     }
 
-    fn step_check_rustc_version(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(log, "Checking rustc version...");
+    fn step_check_rustc_version(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Checking rustc version...");
         let _ = build::check_rustc_version(step)?;
-        info!(log, "Rustc version is correct.");
+        info!("Rustc version is correct.");
         Ok(())
     }
 
-    fn step_add_wasm_target(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Adding wasm-target...");
-        build::rustup_add_wasm_target(log, step)?;
-        info!(&log, "Adding wasm-target was successful.");
+    fn step_add_wasm_target(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Adding wasm-target...");
+        build::rustup_add_wasm_target(step)?;
+        info!("Adding wasm-target was successful.");
         Ok(())
     }
 
-    fn step_build_tests(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(log, "Compiling tests to wasm...");
+    fn step_build_tests(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Compiling tests to wasm...");
 
         let msg = format!("{}Compiling tests to WASM...", emoji::CYCLONE);
         PBAR.step(step, &msg);
 
-        build::cargo_build_wasm_tests(log, &self.crate_path, !self.release)?;
+        build::cargo_build_wasm_tests(&self.crate_path, !self.release)?;
 
-        info!(log, "Finished compiling tests to wasm.");
+        info!("Finished compiling tests to wasm.");
         Ok(())
     }
 
-    fn step_install_wasm_bindgen(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
-        info!(&log, "Identifying wasm-bindgen dependency...");
+    fn step_install_wasm_bindgen(&mut self, step: &Step) -> Result<(), Error> {
+        info!("Identifying wasm-bindgen dependency...");
         let lockfile = Lockfile::new(&self.crate_data)?;
         let bindgen_version = lockfile.require_wasm_bindgen()?;
 
@@ -272,51 +272,45 @@ impl Test {
 
         let install_permitted = match self.mode {
             BuildMode::Normal => {
-                info!(&log, "Ensuring wasm-bindgen-cli is installed...");
+                info!("Ensuring wasm-bindgen-cli is installed...");
                 true
             }
             BuildMode::Force => {
-                info!(&log, "Ensuring wasm-bindgen-cli is installed...");
+                info!("Ensuring wasm-bindgen-cli is installed...");
                 true
             }
             BuildMode::Noinstall => {
-                info!(&log, "Searching for existing wasm-bindgen-cli install...");
+                info!("Searching for existing wasm-bindgen-cli install...");
                 false
             }
         };
 
-        let dl = bindgen::install_wasm_bindgen(
-            &self.cache,
-            &bindgen_version,
-            install_permitted,
-            step,
-            log,
-        )?;
+        let dl =
+            bindgen::install_wasm_bindgen(&self.cache, &bindgen_version, install_permitted, step)?;
 
         self.test_runner_path = Some(dl.binary("wasm-bindgen-test-runner"));
 
-        info!(&log, "Getting wasm-bindgen-cli was successful.");
+        info!("Getting wasm-bindgen-cli was successful.");
         Ok(())
     }
 
-    fn step_test_node(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_node(&mut self, step: &Step) -> Result<(), Error> {
         assert!(self.node);
-        info!(log, "Running tests in node...");
+        info!("Running tests in node...");
         PBAR.step(step, "Running tests in node...");
         test::cargo_test_wasm(
             &self.crate_path,
             self.release,
-            log,
             Some((
                 "CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER",
                 &self.test_runner_path.as_ref().unwrap(),
             )),
         )?;
-        info!(log, "Finished running tests in node.");
+        info!("Finished running tests in node.");
         Ok(())
     }
 
-    fn step_get_chromedriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_chromedriver(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Getting chromedriver...");
         assert!(self.chrome && self.chromedriver.is_none());
 
@@ -327,14 +321,14 @@ impl Test {
         Ok(())
     }
 
-    fn step_test_chrome(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_chrome(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Running tests in Chrome...");
 
         let chromedriver = self.chromedriver.as_ref().unwrap().display().to_string();
         let chromedriver = chromedriver.as_str();
         info!(
-            log,
-            "Running tests in Chrome with chromedriver at {}", chromedriver
+            "Running tests in Chrome with chromedriver at {}",
+            chromedriver
         );
 
         let test_runner = self
@@ -344,7 +338,7 @@ impl Test {
             .display()
             .to_string();
         let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);
 
         let mut envs = vec![
             ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@@ -354,11 +348,11 @@ impl Test {
             envs.push(("NO_HEADLESS", "1"));
         }
 
-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
         Ok(())
     }
 
-    fn step_get_geckodriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_geckodriver(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Getting geckodriver...");
         assert!(self.firefox && self.geckodriver.is_none());
 
@@ -369,14 +363,14 @@ impl Test {
         Ok(())
     }
 
-    fn step_test_firefox(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_firefox(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Running tests in Firefox...");
 
         let geckodriver = self.geckodriver.as_ref().unwrap().display().to_string();
         let geckodriver = geckodriver.as_str();
         info!(
-            log,
-            "Running tests in Firefox with geckodriver at {}", geckodriver
+            "Running tests in Firefox with geckodriver at {}",
+            geckodriver
         );
 
         let test_runner = self
@@ -386,7 +380,7 @@ impl Test {
             .display()
             .to_string();
         let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);
 
         let mut envs = vec![
             ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@@ -396,11 +390,11 @@ impl Test {
             envs.push(("NO_HEADLESS", "1"));
         }
 
-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
         Ok(())
     }
 
-    fn step_get_safaridriver(&mut self, step: &Step, _log: &Logger) -> Result<(), Error> {
+    fn step_get_safaridriver(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Getting safaridriver...");
         assert!(self.safari && self.safaridriver.is_none());
 
@@ -408,14 +402,14 @@ impl Test {
         Ok(())
     }
 
-    fn step_test_safari(&mut self, step: &Step, log: &Logger) -> Result<(), Error> {
+    fn step_test_safari(&mut self, step: &Step) -> Result<(), Error> {
         PBAR.step(step, "Running tests in Safari...");
 
         let safaridriver = self.safaridriver.as_ref().unwrap().display().to_string();
         let safaridriver = safaridriver.as_str();
         info!(
-            log,
-            "Running tests in Safari with safaridriver at {}", safaridriver
+            "Running tests in Safari with safaridriver at {}",
+            safaridriver
         );
 
         let test_runner = self
@@ -425,7 +419,7 @@ impl Test {
             .display()
             .to_string();
         let test_runner = test_runner.as_str();
-        info!(log, "Using wasm-bindgen test runner at {}", test_runner);
+        info!("Using wasm-bindgen test runner at {}", test_runner);
 
         let mut envs = vec![
             ("CARGO_TARGET_WASM32_UNKNOWN_UNKNOWN_RUNNER", test_runner),
@@ -435,7 +429,7 @@ impl Test {
             envs.push(("NO_HEADLESS", "1"));
         }
 
-        test::cargo_test_wasm(&self.crate_path, self.release, log, envs)?;
+        test::cargo_test_wasm(&self.crate_path, self.release, envs)?;
         Ok(())
     }
 }
diff --git a/src/lib.rs b/src/lib.rs
index 901e1a37..0f0e4a0e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -20,11 +20,8 @@ extern crate serde_ignored;
 extern crate serde_json;
 #[macro_use]
 extern crate structopt;
-#[macro_use]
-extern crate slog;
 extern crate dialoguer;
-extern crate slog_async;
-extern crate slog_term;
+extern crate log;
 extern crate toml;
 extern crate walkdir;
 extern crate wasm_pack_binary_install;
@@ -36,7 +33,6 @@ pub mod command;
 pub mod emoji;
 pub mod license;
 pub mod lockfile;
-pub mod logger;
 pub mod manifest;
 pub mod npm;
 pub mod progressbar;
diff --git a/src/logger.rs b/src/logger.rs
deleted file mode 100644
index 08add5de..00000000
--- a/src/logger.rs
+++ /dev/null
@@ -1,76 +0,0 @@
-//! Logging facilities for `wasm-pack`.
-
-use command::Command;
-use failure;
-use slog::{Drain, Level, Logger};
-use slog_async::Async;
-use slog_term::{FullFormat, PlainDecorator};
-use std::fs::OpenOptions;
-use std::path::PathBuf;
-
-/// Create the logger for wasm-pack that will output any info warning or errors we encounter
-pub fn new(cmd: &Command, verbosity: u8) -> Result<Logger, failure::Error> {
-    let log_path = log_file_path(&cmd);
-    let file = OpenOptions::new()
-        .create(true)
-        .append(true)
-        .open(log_path)?;
-
-    let decorator = PlainDecorator::new(file);
-    let drain = FullFormat::new(decorator).build().fuse();
-
-    // Set the log level based off the number of v passed in to the command line args.
-    // Level level means only messages of that level and higher are logged. If we have
-    // an error then we'll log it unconditionally, but extra levels are only available
-    // with extra v
-    let log_level = match verbosity {
-        0 => Level::Error,
-        1 => Level::Info,
-        2 => Level::Debug,
-        _ => Level::Trace,
-    };
-    let drain = Async::new(drain).build().filter_level(log_level).fuse();
-    Ok(Logger::root(drain, o!()))
-}
-
-/// Figure out where to stick the log based off the command arguments given
-fn log_file_path(cmd: &Command) -> PathBuf {
-    let path = match cmd {
-        Command::Build(build_opts) => &build_opts.path,
-        Command::Pack { path } => path,
-        Command::Publish {
-            target: _,
-            path,
-            access: _,
-        } => path,
-        Command::Test(test_opts) => &test_opts.path,
-        Command::Login { .. } => &None,
-    };
-
-    // If the path exists attempt to use it, if not default to the current directory
-    if let Some(ref path) = path {
-        let mut path_buf = PathBuf::from(path);
-        path_buf.push("Cargo.toml");
-
-        // If the manifest file exists put the log in that directory otherwise default
-        // to the current directory.
-        if path_buf.exists() {
-            path_buf.pop();
-            path_buf.push("wasm-pack.log");
-            path_buf
-        } else {
-            let mut path_buf = this_dir();
-            path_buf.push("wasm-pack.log");
-            path_buf
-        }
-    } else {
-        let mut path_buf = this_dir();
-        path_buf.push("wasm-pack.log");
-        path_buf
-    }
-}
-
-/// Return a `PathBuf` for the current directory
-fn this_dir() -> PathBuf {
-    PathBuf::from(".")
-}
diff --git a/src/main.rs b/src/main.rs
index 0af82966..26698a28 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,4 +1,5 @@
 extern crate atty;
+extern crate env_logger;
 #[macro_use]
 extern crate failure;
 #[macro_use]
@@ -9,11 +10,12 @@ extern crate which;
 
 use std::env;
 use structopt::StructOpt;
-use wasm_pack::{command::run_wasm_pack, logger, Cli};
+use wasm_pack::{command::run_wasm_pack, Cli};
 
 mod installer;
 
 fn main() {
+    env_logger::init();
     setup_panic!();
     if let Err(e) = run() {
         eprintln!("Error: {}", e);
@@ -39,7 +41,6 @@ fn run() -> Result<(), failure::Error> {
     }
 
     let args = Cli::from_args();
-    let log = logger::new(&args.cmd, args.verbosity)?;
-    run_wasm_pack(args.cmd, &log)?;
+    run_wasm_pack(args.cmd)?;
     Ok(())
 }
diff --git a/src/npm.rs b/src/npm.rs
index 76fe8417..810f348e 100644
--- a/src/npm.rs
+++ b/src/npm.rs
@@ -3,22 +3,21 @@
 use child;
 use command::publish::access::Access;
 use failure::{self, ResultExt};
-use slog::Logger;
 use std::process::{Command, Stdio};
 
 /// The default npm registry used when we aren't working with a custom registry.
 pub const DEFAULT_NPM_REGISTRY: &'static str = "https://registry.npmjs.org/";
 
 /// Run the `npm pack` command.
-pub fn npm_pack(log: &Logger, path: &str) -> Result<(), failure::Error> {
+pub fn npm_pack(path: &str) -> Result<(), failure::Error> {
     let mut cmd = Command::new("npm");
     cmd.current_dir(path).arg("pack");
-    child::run(log, cmd, "npm pack").context("Packaging up your code failed")?;
+    child::run(cmd, "npm pack").context("Packaging up your code failed")?;
     Ok(())
 }
 
 /// Run the `npm publish` command.
-pub fn npm_publish(log: &Logger, path: &str, access: Option<Access>) -> Result<(), failure::Error> {
+pub fn npm_publish(path: &str, access: Option<Access>) -> Result<(), failure::Error> {
     let mut cmd = Command::new("npm");
     match access {
         Some(a) => cmd
@@ -34,13 +33,12 @@ pub fn npm_publish(log: &Logger, path: &str, access: Option<Access>) -> Result<(
             .stdout(Stdio::inherit()),
     };
 
-    child::run(log, cmd, "npm publish").context("Publishing to npm failed")?;
+    child::run(cmd, "npm publish").context("Publishing to npm failed")?;
     Ok(())
 }
 
 /// Run the `npm login` command.
 pub fn npm_login(
-    log: &Logger,
     registry: &String,
     scope: &Option<String>,
     always_auth: bool,
@@ -67,7 +65,7 @@ pub fn npm_login(
         .arg(args)
         .stdin(Stdio::inherit())
         .stdout(Stdio::inherit());
-    child::run(log, cmd, "npm login")
+    child::run(cmd, "npm login")
         .with_context(|_| format!("Login to registry {} failed", registry))?;
     Ok(())
 }
diff --git a/src/test/mod.rs b/src/test/mod.rs
index 1b71fed8..0ec11e95 100644
--- a/src/test/mod.rs
+++ b/src/test/mod.rs
@@ -4,19 +4,14 @@ pub mod webdriver;
 
 use child;
 use failure::{self, ResultExt};
-use slog::Logger;
+use log::info;
 use std::ffi::OsStr;
 use std::path::Path;
 use std::process::Command;
 
 /// Run `cargo test` with the `nightly` toolchain and targeting
 /// `wasm32-unknown-unknown`.
-pub fn cargo_test_wasm<I, K, V>(
-    path: &Path,
-    release: bool,
-    log: &Logger,
-    envs: I,
-) -> Result<(), failure::Error>
+pub fn cargo_test_wasm<I, K, V>(path: &Path, release: bool, envs: I) -> Result<(), failure::Error>
 where
     I: IntoIterator<Item = (K, V)>,
     K: AsRef<OsStr>,
@@ -30,12 +25,11 @@ where
             cmd.arg("--release");
         }
         cmd.arg("--target").arg("wasm32-unknown-unknown");
-        child::run(log, cmd, "cargo test")
-            .context("Running Wasm tests with wasm-bindgen-test failed")?
+        child::run(cmd, "cargo test").context("Running Wasm tests with wasm-bindgen-test failed")?
     };
 
     for line in output.lines() {
-        info!(log, "test output: {}", line);
+        info!("test output: {}", line);
         println!("{}", line);
     }
     Ok(())
diff --git a/tests/all/main.rs b/tests/all/main.rs
index 572d6554..61875e07 100644
--- a/tests/all/main.rs
+++ b/tests/all/main.rs
@@ -4,8 +4,6 @@ extern crate lazy_static;
 #[macro_use]
 extern crate serde_derive;
 extern crate serde_json;
-#[macro_use]
-extern crate slog;
 extern crate structopt;
 extern crate tempfile;
 extern crate wasm_pack;
diff --git a/tests/all/utils/fixture.rs b/tests/all/utils/fixture.rs
index 05968739..2ed126e6 100644
--- a/tests/all/utils/fixture.rs
+++ b/tests/all/utils/fixture.rs
@@ -1,4 +1,3 @@
-use super::logger::null_logger;
 use std::env;
 use std::fs;
 use std::mem::ManuallyDrop;
@@ -170,7 +169,6 @@ impl Fixture {
         static INSTALL_WASM_BINDGEN: Once = ONCE_INIT;
         let cache = self.cache();
         let version = "0.2.21";
-        let log = &null_logger();
 
         let download = || {
             if let Ok(download) =
@@ -179,7 +177,7 @@ impl Fixture {
                 return Ok(download);
             }
 
-            wasm_pack::bindgen::cargo_install_wasm_bindgen(log, &cache, version, true)
+            wasm_pack::bindgen::cargo_install_wasm_bindgen(&cache, version, true)
         };
 
         // Only one thread can perform the actual download, and then afterwards
@@ -243,18 +241,17 @@ impl Fixture {
     }
 
     pub fn run(&self, cmd: wasm_pack::command::Command) -> Result<(), failure::Error> {
-        let logger = wasm_pack::logger::new(&cmd, 3)?;
         match cmd {
             wasm_pack::command::Command::Test(cmd) => {
                 let _lock = self.lock();
                 let mut test = wasm_pack::command::test::Test::try_from_opts(cmd)?;
                 test.set_cache(self.cache());
-                test.run(&logger)
+                test.run()
             }
             wasm_pack::command::Command::Build(cmd) => {
                 let mut build = wasm_pack::command::build::Build::try_from_opts(cmd)?;
                 build.set_cache(self.cache());
-                build.run(&logger)
+                build.run()
             }
             _ => unreachable!(),
         }
diff --git a/tests/all/utils/logger.rs b/tests/all/utils/logger.rs
deleted file mode 100644
index 46cc0d7e..00000000
--- a/tests/all/utils/logger.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-use slog::Logger;
-
-// Create a logger that ignores log messages for testing.
-pub fn null_logger() -> Logger {
-    Logger::root(slog::Discard, o!())
-}
diff --git a/tests/all/utils/mod.rs b/tests/all/utils/mod.rs
index 655b80d8..8b4244fa 100644
--- a/tests/all/utils/mod.rs
+++ b/tests/all/utils/mod.rs
@@ -1,4 +1,3 @@
 pub mod file;
 pub mod fixture;
-pub mod logger;
 pub mod manifest;