[chore] Bump dev dependencies (#100)

Author: darrachequesne

package.json

@@ -7,9 +7,9 @@
   "homepage": "https://github.com/socketio/engine.io-parser",
   "devDependencies": {
     "expect.js": "0.3.1",
-    "mocha": "3.2.0",
-    "socket.io-browsers": "^1.0.0",
-    "zuul": "3.11.1",
+    "mocha": "^5.2.0",
+    "socket.io-browsers": "^1.0.2",
+    "zuul": "^3.12.0",
     "zuul-ngrok": "4.0.0"
   },
   "dependencies": {