Update ws to 3.3.1

As per nodesecurity recommendations

Author: montymxb

package.json

@@ -29,7 +29,7 @@
   },
   "dependencies": {
     "babel-runtime": "^6.11.6",
-    "ws": "^2.2.3",
+    "ws": "^3.3.1",
     "xmlhttprequest": "^1.7.0"
   },
   "devDependencies": {