Fix go mod

_codegen/go.mod

@@ -2,7 +2,4 @@ module github.com/stretchr/testify/_codegen
 
 go 1.11
 
-require (
-	github.com/ernesto-jimenez/gogen v0.0.0-20180125220232-d7d4131e6607
-	github.com/stretchr/testify v1.5.1 // indirect
-)
+require github.com/ernesto-jimenez/gogen v0.0.0-20180125220232-d7d4131e6607

_codegen/go.sum

@@ -1,13 +1,2 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/ernesto-jimenez/gogen v0.0.0-20180125220232-d7d4131e6607 h1:cTavhURetDkezJCvxFggiyLeP40Mrk/TtVg2+ycw1Es=
 github.com/ernesto-jimenez/gogen v0.0.0-20180125220232-d7d4131e6607/go.mod h1:Cg4fM0vhYWOZdgM7RIOSTRNIc8/VT7CXClC3Ni86lu4=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
-github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
-gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=