[chore] Bump ws to version 3.3.1 (#587)

Related: https://nodesecurity.io/advisories/550

Author: Matt Grande

package.json

@@ -32,7 +32,7 @@
     "indexof": "0.0.1",
     "parseqs": "0.0.5",
     "parseuri": "0.0.5",
-    "ws": "~2.3.1",
+    "ws": "~3.3.1",
     "xmlhttprequest-ssl": "~1.5.4",
     "yeast": "0.1.2"
   },