Gopk.toml cleanup

See #3988

Gopkg.lock

@@ -285,6 +285,6 @@
 [solve-meta]
   analyzer-name = "dep"
   analyzer-version = 1
-  inputs-digest = "9976dbdbbdc93a77efbf710fec19b50240c8cea185d20a7c3ed4579e4c06cb78"
+  inputs-digest = "d828d7645269ae1e20eeca6927d5aa7fbd53915df25a89179b7e04fb9993ac0a"
   solver-name = "gps-cdcl"
   solver-version = 1

Gopkg.toml

@@ -1,25 +1,4 @@
 
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#  name = "github.com/x/y"
-#  version = "2.4.0"
-
 
 [[constraint]]
   name = "github.com/BurntSushi/toml"
@@ -77,10 +56,6 @@
   name = "github.com/kyokomi/emoji"
   version = "1.5.0"
 
-[[constraint]]
-  name = "github.com/magefile/mage"
-  version = "2.0.0"
-
 [[constraint]]
   branch = "master"
   name = "github.com/markbates/inflect"