Merge pull request #231 from shower/greenkeeper-load-grunt-tasks-3.4.0

load-grunt-tasks@3.4.0 untested ⚠️

package.json

@@ -33,6 +33,6 @@
     "grunt-contrib-copy": "^0.8.2",
     "grunt-gh-pages": "^1.0.0",
     "grunt-text-replace": "^0.4.0",
-    "load-grunt-tasks": "^3.3.0"
+    "load-grunt-tasks": "^3.4.0"
   }
 }