chore(package): update gulp-util to version 3.0.8

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -50,7 +50,7 @@
     "gulp-eslint": "^3.0.1",
     "gulp-istanbul": "^1.0.0",
     "gulp-mocha": "^3.0.0",
-    "gulp-util": "^3.0.7",
+    "gulp-util": "^3.0.8",
     "semantic-release": "^4.3.5"
   },
   "config": {