chore(package): update zuul to version 3.11.0 (#594)

https://greenkeeper.io/

package.json

@@ -43,7 +43,7 @@
     "chai": "^3.4.0",
     "eslint": "^2.5.1",
     "mocha": "^3.0.2",
-    "zuul": "^3.7.0"
+    "zuul": "^3.11.0"
   },
   "spm": {
     "main": "mustache.js",