Update module github.com/spf13/viper to v1.18.1

go.mod

@@ -10,16 +10,11 @@ require (
 	github.com/google/wire v0.4.0
 	github.com/labstack/echo v3.3.10+incompatible
 	github.com/labstack/gommon v0.3.0 // indirect
-	github.com/mattn/go-colorable v0.1.4 // indirect
-	github.com/mattn/go-isatty v0.0.12 // indirect
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/rhysd/go-github-selfupdate v1.2.2
-	github.com/spf13/afero v1.3.0
+	github.com/spf13/afero v1.11.0
 	github.com/spf13/cobra v1.0.0
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.0
+	github.com/spf13/viper v1.18.1
 	github.com/valyala/fasttemplate v1.1.0 // indirect
-	golang.org/x/crypto v0.0.0-20200128174031-69ecbb4d6d5d // indirect
-	golang.org/x/net v0.0.0-20200202094626-16171245cfb2 // indirect
-	golang.org/x/sys v0.0.0-20200124204421-9fbb57f87de9 // indirect
 )