message: also respect release tag for sub packages
diff: @@ -29,12 +29,20 @@ if [[ $REPLY =~ ^[Yy]$ ]]; then
  # update packages
  cd packages/vue-template-compiler
  npm version $VERSION
  + if [[ -z $RELEASE_TAG ]]; then
  + npm publish --tag $RELEASE_TAG
  + else
  npm publish
  + fi
  cd -
  cd packages/vue-server-renderer
  npm version $VERSION
  + if [[ -z $RELEASE_TAG ]]; then
  + npm publish --tag $RELEASE_TAG
  + else
  npm publish
  + fi
  cd -
  # commit
  