Update socket.io library

Author: Dahlgren

package.json

@@ -40,7 +40,7 @@
     "raw-loader": "^0.5.1",
     "serve-static": "^1.12.1",
     "slugify": "^1.1.0",
-    "socket.io": "^1.0.4",
+    "socket.io": "2.1.1",
     "steam-workshop": "0.0.4",
     "style-loader": "0.13.1",
     "sweetalert": "^1.1.3",