scripts/build/release_publisher/publisher_test.go: Fix trivial megacheck warning.

See,
$ gometalinter --vendor --deadline 6m --disable-all --enable=megacheck ./...
scripts/build/release_publisher/publisher_test.go:14:2:warning: should merge variable declaration with assignment on next line (S1021) (megacheck)

scripts/build/release_publisher/publisher_test.go

@@ -3,15 +3,16 @@ package main
 import "testing"
 
 func TestPreparingReleaseFromRemote(t *testing.T) {
+
+	var builder releaseBuilder
+
 	versionIn := "v5.2.0-beta1"
 	expectedVersion := "5.2.0-beta1"
 	whatsNewUrl := "https://whatsnews.foo/"
 	relNotesUrl := "https://relnotes.foo/"
 	expectedArch := "amd64"
 	expectedOs := "linux"
-	buildArtifacts := []buildArtifact{{expectedOs,expectedArch, ".linux-amd64.tar.gz"}}
-
-	var builder releaseBuilder
+	buildArtifacts := []buildArtifact{{expectedOs, expectedArch, ".linux-amd64.tar.gz"}}
 
 	builder = releaseFromExternalContent{
 		getter:                 mockHttpGetter{},
@@ -50,7 +51,6 @@ func (mockHttpGetter) getContents(url string) (string, error) {
 	return url, nil
 }
 
-
 func TestPreparingReleaseFromLocal(t *testing.T) {
 	whatsNewUrl := "https://whatsnews.foo/"
 	relNotesUrl := "https://relnotes.foo/"