Added grunt-update-json

Author: fabiantheblind

package.json

@@ -18,6 +18,7 @@
     "grunt-lib-phantomjs": "~0.4.0",
     "grunt-mocha": "~0.4.6",
     "grunt-release": "^0.7.0",
+    "grunt-update-json": "^0.1.3",
     "phantomjs": "~1.9.2-4"
   },
   "licenses": [