[chore] Bump zuul to 3.11.0 & zuul-ngrok to 4.0.0 (#498)

Author: darrachequesne

package.json

@@ -60,9 +60,9 @@
     "mocha": "1.16.2",
     "webpack": "1.12.12",
     "webpack-stream": "3.1.0",
-    "zuul": "3.10.1",
+    "zuul": "3.11.0",
     "zuul-builder-webpack": "1.1.0",
-    "zuul-ngrok": "3.2.0"
+    "zuul-ngrok": "4.0.0"
   },
   "scripts": {
     "test": "gulp test"