Merge pull request #103 from mozilla/greenkeeper-load-grunt-tasks-3.3.0

Update load-grunt-tasks to version 3.3.0 🚀

package.json

@@ -34,7 +34,7 @@
     "isparta": "3.1.0",
     "json-loader": "0.5.3",
     "load-grunt-configs": "0.4.3",
-    "load-grunt-tasks": "3.2.0",
+    "load-grunt-tasks": "3.3.0",
     "mocha": "2.3.3",
     "sinon": "1.17.1",
     "source-map-support": "0.3.2",