diff --git a/.travis.yml b/.travis.yml
index 58c555b..554c526 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,8 @@ os:
   - linux
   - osx
 julia:
-  - 0.6
+  - 0.7
+  - nightly
 notifications:
   email: false
 git:
diff --git a/LICENSE.md b/LICENSE.md
index d971b66..a14cd42 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,6 +1,6 @@
 The CSVFiles.jl package is licensed under the MIT "Expat" License:
 
-> Copyright (c) 2017: David Anthoff.
+> Copyright (c) 2017-2018: David Anthoff.
 > 
 > 
 > Permission is hereby granted, free of charge, to any person obtaining a copy
diff --git a/NEWS.md b/NEWS.md
index 93fb344..272ad7f 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,3 +1,6 @@
+# CSVFiles.jl v0.9.0
+* Drop julia 0.6 support, add julia 0.7 support
+
 # CSVFiles.jl v0.8.0
 * Add nastring option to save
 
diff --git a/REQUIRE b/REQUIRE
index 9c392ba..9d454aa 100644
--- a/REQUIRE
+++ b/REQUIRE
@@ -1,10 +1,10 @@
-julia 0.6
-TextParse 0.4.0
-IteratorInterfaceExtensions 0.0.2
-TableTraits 0.0.3
-TableTraitsUtils 0.1.3
-DataValues 0.1.0
-FileIO 0.9.0
+julia 0.7-
+TextParse 0.6.0
+IteratorInterfaceExtensions 0.1.0
+TableTraits 0.3.0
+TableTraitsUtils 0.2.0
+DataValues 0.4.2
+FileIO 1.0.0
 HTTP 0.6.0
-IterableTables 0.6.1
-TableShowUtils 0.0.1
+IterableTables 0.8.1
+TableShowUtils 0.1.0
diff --git a/appveyor.yml b/appveyor.yml
index fd4c9fe..cef7280 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,14 +1,17 @@
 environment:
   matrix:
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x86/0.6/julia-0.6-latest-win32.exe"
-  - JULIA_URL: "https://julialang-s3.julialang.org/bin/winnt/x64/0.6/julia-0.6-latest-win64.exe"
+  - julia_version: 0.7
+  - julia_version: latest
+
+platform:
+  - x86
+  - x64
 
 ## uncomment the following lines to allow failures on nightly julia
 ## (tests will run but not make your overall status red)
 #matrix:
 #  allow_failures:
-#  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x86/julia-latest-win32.exe"
-#  - JULIA_URL: "https://julialangnightlies-s3.julialang.org/bin/winnt/x64/julia-latest-win64.exe"
+#  - julia_version: latest
 
 branches:
   only:
@@ -22,24 +25,12 @@ notifications:
     on_build_status_changed: false
 
 install:
-  - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12"
-# If there's a newer build queued for the same PR, cancel this one
-  - ps: if ($env:APPVEYOR_PULL_REQUEST_NUMBER -and $env:APPVEYOR_BUILD_NUMBER -ne ((Invoke-RestMethod `
-        https://ci.appveyor.com/api/projects/$env:APPVEYOR_ACCOUNT_NAME/$env:APPVEYOR_PROJECT_SLUG/history?recordsNumber=50).builds | `
-        Where-Object pullRequestId -eq $env:APPVEYOR_PULL_REQUEST_NUMBER)[0].buildNumber) { `
-        throw "There are newer queued builds for this pull request, failing early." }
-# Download most recent Julia Windows binary
-  - ps: (new-object net.webclient).DownloadFile(
-        $env:JULIA_URL,
-        "C:\projects\julia-binary.exe")
-# Run installer silently, output to C:\projects\julia
-  - C:\projects\julia-binary.exe /S /D=C:\projects\julia
+  - ps: iex ((new-object net.webclient).DownloadString('https://raw.githubusercontent.com/JuliaCI/Appveyor.jl/master/bin/install.ps1'))
 
 build_script:
-# Need to convert from shallow to complete for Pkg.clone to work
-  - IF EXIST .git\shallow (git fetch --unshallow)
-  - C:\projects\julia\bin\julia -e "versioninfo();
-      Pkg.clone(pwd(), \"CSVFiles\"); Pkg.build(\"CSVFiles\")"
+  - echo "%JL_BUILD_SCRIPT%"
+  - julia -e "%JL_BUILD_SCRIPT%"
 
 test_script:
-  - C:\projects\julia\bin\julia -e "Pkg.test(\"CSVFiles\")"
+  - echo "%JL_TEST_SCRIPT%"
+  - julia -e "%JL_TEST_SCRIPT%"
diff --git a/src/csv_writer.jl b/src/csv_writer.jl
index ab80a35..35418c4 100644
--- a/src/csv_writer.jl
+++ b/src/csv_writer.jl
@@ -1,25 +1,24 @@
+function _writevalue(io::IO, value::String, delim, quotechar::Nothing, escapechar, nastring)
+    print(io, value)
+end
+
 function _writevalue(io::IO, value::String, delim, quotechar, escapechar, nastring)
-    if isnull(quotechar)
-        print(io, value)
-    else
-        quotechar_unpacked = get(quotechar)
-        print(io, quotechar_unpacked)
-        for c in value
-            if c==quotechar_unpacked || c==escapechar
-                print(io, escapechar)
-            end
-            print(io, c)
+    print(io, quotechar)
+    for c in value
+        if c==quotechar || c==escapechar
+            print(io, escapechar)
         end
-        print(io, quotechar_unpacked)
+        print(io, c)
     end
+    print(io, quotechar)
 end
 
 function _writevalue(io::IO, value, delim, quotechar, escapechar, nastring)
     print(io, value)
 end
 
-function _writevalue{T}(io::IO, value::DataValue{T}, delim, quotechar, escapechar, nastring)
-    if isnull(value)
+function _writevalue(io::IO, value::DataValue{T}, delim, quotechar, escapechar, nastring) where {T}
+    if isna(value)
         print(io, nastring)
     else
         _writevalue(io, get(value), delim, quotechar, escapechar, nastring)
@@ -27,7 +26,7 @@ function _writevalue{T}(io::IO, value::DataValue{T}, delim, quotechar, escapecha
 end
 
 
-@generated function _writecsv{T}(io::IO, it, ::Type{T}, delim, quotechar, escapechar, nastring)
+@generated function _writecsv(io::IO, it, ::Type{T}, delim, quotechar, escapechar, nastring) where {T}
     col_names = fieldnames(T)
     n = length(col_names)
     push_exprs = Expr(:block)
@@ -50,19 +49,17 @@ function _save(io, data; delim=',', quotechar='"', escapechar='\\', nastring="NA
     isiterabletable(data) || error("Can't write this data to a CSV file.")
 
     it = getiterator(data)
-    colnames = TableTraits.column_names(it)
-
-    quotechar_internal = quotechar==nothing ? Nullable{Char}() : Nullable{Char}(quotechar)
+    colnames = collect(eltype(it).parameters[1])
 
     if header
-        if isnull(quotechar_internal)
+        if quotechar===nothing
             join(io,[string(colname) for colname in colnames],delim)
         else
-            join(io,["$(quotechar)" *replace(string(colname), quotechar, "$(escapechar)$(quotechar)") * "$(quotechar)" for colname in colnames],delim)
+            join(io,["$(quotechar)" * replace(string(colname), quotechar => "$(escapechar)$(quotechar)") * "$(quotechar)" for colname in colnames],delim)
         end
         println(io)
     end
-    _writecsv(io, it, eltype(it), delim, quotechar_internal, escapechar, nastring)
+    _writecsv(io, it, eltype(it), delim, quotechar, escapechar, nastring)
 end
 
 function _save(filename::AbstractString, data; delim=',', quotechar='"', escapechar='\\', nastring="NA", header=true)
diff --git a/test/runtests.jl b/test/runtests.jl
index 4e01ea3..734c76b 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -1,14 +1,16 @@
 using CSVFiles
-using NamedTuples
+using IteratorInterfaceExtensions
+using TableTraits
+using FileIO
 using DataValues
-using Base.Test
+using Test
 
 @testset "CSVFiles" begin
 
 @testset "basic" begin
     array = collect(load(joinpath(@__DIR__, "data.csv")))
     @test length(array) == 3
-    @test array == [@NT(Name="John",Age=34.,Children=2),@NT(Name="Sally",Age=54.,Children=1),@NT(Name="Jim",Age=23.,Children=0)]
+    @test array == [(Name="John",Age=34.,Children=2),(Name="Sally",Age=54.,Children=1),(Name="Jim",Age=23.,Children=0)]
 
     output_filename = tempname() * ".csv"
 
@@ -19,7 +21,7 @@ using Base.Test
 
         @test array == array2
     finally
-        gc()
+        GC.gc()
         rm(output_filename)
     end
 end
@@ -32,7 +34,7 @@ end
 end
 
 @testset "missing values" begin
-    array3 = [@NT(a=DataValue(3),b="df\"e"),@NT(a=DataValue{Int}(),b="something")]
+    array3 = [(a=DataValue(3),b="df\"e"),(a=DataValue{Int}(),b="something")]
 
     @testset "default" begin
         output_filename2 = tempname() * ".csv"
@@ -56,7 +58,7 @@ end
 end
 
 @testset "Less Basic" begin
-    array = [@NT(Name="John",Age=34.,Children=2),@NT(Name="Sally",Age=54.,Children=1),@NT(Name="Jim",Age=23.,Children=0)]
+    array = [(Name="John",Age=34.,Children=2),(Name="Sally",Age=54.,Children=1),(Name="Jim",Age=23.,Children=0)]
     @testset "remote loading" begin
         rem_array = collect(load("https://raw.githubusercontent.com/queryverse/CSVFiles.jl/v0.2.0/test/data.csv"))
         @test length(rem_array) == 3
@@ -73,7 +75,7 @@ end
             @test length(array4) == 3
             @test array4 == array
         finally
-            gc()
+            GC.gc()
             rm(output_filename3)
         end
     end
@@ -86,14 +88,14 @@ end
             array |> save(output_filename4, quotechar=nothing)
 
         finally
-            gc()
+            GC.gc()
             rm(output_filename4)
         end
     end
 end
 
 @testset "Streams" begin
-    data = [@NT(Name="John",Age=34.,Children=2),@NT(Name="Sally",Age=54.,Children=1),@NT(Name="Jim",Age=23.,Children=0)]
+    data = [(Name="John",Age=34.,Children=2),(Name="Sally",Age=54.,Children=1),(Name="Jim",Age=23.,Children=0)]
 
     @testset "CSV"  begin
         stream = IOBuffer()