chore(package): update grunt-cli to version 1.3.1

Closes #14

Author: greenkeeper[bot]

package.json

@@ -18,7 +18,7 @@
   "devDependencies": {
     "grunt": "~1.0.1",
     "grunt-browserify": "*",
-    "grunt-cli": "~1.2.0",
+    "grunt-cli": "~1.3.1",
     "grunt-contrib-coffee": "*",
     "grunt-contrib-concat": "^1.0.1",
     "grunt-contrib-jasmine": "*",