[chore] Bump ws to version 2.3.1 (#564)

Author: darrachequesne

package.json

@@ -32,7 +32,7 @@
     "parsejson": "0.0.3",
     "parseqs": "0.0.5",
     "parseuri": "0.0.5",
-    "ws": "2.2.3",
+    "ws": "~2.3.1",
     "xmlhttprequest-ssl": "1.5.3",
     "yeast": "0.1.2"
   },