See,

$ gometalinter --vendor --disable-all --enable=golint ./...
build/release_publisher/externalrelease.go:55:6:warning: type getHttpContents should be getHTTPContents (golint)
build/release_publisher/publisher.go:18:2:warning: struct field apiUri should be apiURI (golint)
build/release_publisher/publisher.go:66:6:warning: exported type ReleaseType should have comment or be unexported (golint)
build/release_publisher/publisher.go:69:2:warning: exported const STABLE should have comment (or a comment on this block) or be unexported (golint)
build/release_publisher/publisher.go:185:16:warning: should replace errors.New(fmt.Sprintf(...)) with fmt.Errorf(...) (golint)
build/release_publisher/publisher_test.go:102:6:warning: type mockHttpGetter should be mockHTTPGetter (golint)