go.mod: remove unused packages

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

go.mod

@@ -4,18 +4,15 @@ go 1.12
 
 require (
 	github.com/Jeffail/gabs v1.2.0
-	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
 	github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d // indirect
 	github.com/brancz/gojsontoyaml v0.0.0-20191212081931-bf2969bbd742
 	github.com/campoy/embedmd v1.0.0
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/gogo/protobuf v1.1.1 // indirect
 	github.com/google/go-jsonnet v0.15.1-0.20200319155144-6f135f75bc0e
 	github.com/googleapis/gnostic v0.0.0-20170729233727-0c5108395e2d // indirect
 	github.com/imdario/mergo v0.3.7 // indirect
 	github.com/jsonnet-bundler/jsonnet-bundler v0.3.1
 	github.com/kr/pretty v0.2.0 // indirect
-	github.com/mattn/go-colorable v0.1.4 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.1 // indirect
 	github.com/pkg/errors v0.8.1
@@ -25,7 +22,6 @@ require (
 	golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a // indirect
 	golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db // indirect
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4 // indirect
-	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
 	k8s.io/api v0.0.0-20190313235455-40a48860b5ab // indirect
 	k8s.io/apimachinery v0.0.0-20190313205120-d7deff9243b1