Merge pull request #228 from wechaty/greenkeeper/apiai-4.0.0

Update apiai to the latest version 🚀

package.json

@@ -125,7 +125,7 @@
     "@types/sinon": "1.16.34",
     "@types/request": "0.0.39",
     "@types/ws": "0.0.37",
-    "apiai": "3.0.3",
+    "apiai": "4.0.0",
     "ava": "0.18.0",
     "babel-eslint": "7.1.1",
     "check-node-version": "1.1.2",