Update dependency grunt-contrib-watch to v0.6.1

Author: renovate-bot

assets/plugins/pace/package.json

@@ -18,7 +18,7 @@
     "grunt-contrib-uglify": "0.2.7",
     "grunt-cli": "0.1.13",
     "grunt": "0.4.5",
-    "grunt-contrib-watch": "0.5.3",
+    "grunt-contrib-watch": "0.6.1",
     "color": "0.4.4"
   }
 }