Merge pull request #155 from kubernetes/greenkeeper-gulp-closure-compiler-0.4.0

Update gulp-closure-compiler to version 0.4.0 🚀

package.json

@@ -26,7 +26,7 @@
     "gulp-browserify": "~0.5.1",
     "gulp-chmod": "~1.3.0",
     "gulp-clang-format": "~1.0.23",
-    "gulp-closure-compiler": "~0.3.1",
+    "gulp-closure-compiler": "~0.4.0",
     "gulp-concat": "~2.6.0",
     "gulp-eslint": "~1.1.0",
     "gulp-filter": "~3.0.1",