chore(package): update ws to version 2.1.0 (#3526)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -41,7 +41,7 @@
     "tv4": "1.2.7",
     "winston": "2.3.1",
     "winston-daily-rotate-file": "1.4.4",
-    "ws": "2.0.3"
+    "ws": "2.1.0"
   },
   "devDependencies": {