Removed no more used dependencies in Gopkg

Gopkg.toml

@@ -58,10 +58,6 @@
   branch = "master"
   name = "github.com/bgentry/go-netrc"
 
-[[constraint]]
-  name = "github.com/blang/semver"
-  version = "3.5.1"
-
 [[constraint]]
   name = "github.com/briandowns/spinner"
   version = "1.0.0"
@@ -103,22 +99,10 @@
   name = "github.com/spf13/cobra"
   version = "0.0.1"
 
-[[constraint]]
-  name = "github.com/spf13/viper"
-  version = "1.0.0"
-
 [[constraint]]
   name = "github.com/stretchr/testify"
   version = "1.1.4"
 
-#[[constraint]]
-#  branch = "master"
-#  name = "github.com/theherk/viper"
-
-[[constraint]]
-  name = "github.com/zieckey/goini"
-  version = "1.2.0"
-
 [[constraint]]
   branch = "master"
   name = "golang.org/x/crypto"
@@ -138,4 +122,4 @@
 
 [[constraint]]
   name = "github.com/cavaliercoder/grab"
-  branch = "master"
\ No newline at end of file
+  branch = "master"