Merge pull request #727 from LLK/greenkeeper/socket.io-client-2.0.4

Update socket.io-client to the latest version

package.json

@@ -50,7 +50,7 @@
     "scratch-render": "latest",
     "scratch-storage": "^0.3.0",
     "script-loader": "0.7.0",
-    "socket.io-client": "1.7.3",
+    "socket.io-client": "2.0.4",
     "stats.js": "^0.17.0",
     "tap": "^10.2.0",
     "tiny-worker": "^2.1.1",