chore(package): update grunt-contrib-clean to version 1.0.0

http://greenkeeper.io/

package.json

@@ -28,7 +28,7 @@
   "devDependencies": {
     "grunt": "^0.4.5",
     "grunt-bump": "0.7.0",
-    "grunt-contrib-clean": "^0.7.0",
+    "grunt-contrib-clean": "^1.0.0",
     "grunt-contrib-compress": "^0.14.0",
     "grunt-contrib-copy": "^0.8.2",
     "grunt-gh-pages": "^1.0.0",