change grunt dependecy to ">=0.4.5"

Author: nirnatan

package.json

@@ -44,7 +44,7 @@
     "jasmine-spec-reporter": "^2.5.0"
   },
   "devDependencies": {
-    "grunt": "^0.4.5",
+    "grunt": ">=0.4.5",
     "grunt-eslint": "^18.0.0"
   },
   "peerDependencies": {