Bump socket.io from 2.3.0 to 2.4.0 (#2)

Bumps [socket.io](https://github.com/socketio/socket.io) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/socketio/socket.io/releases)
- [Changelog](https://github.com/socketio/socket.io/blob/2.4.0/CHANGELOG.md)
- [Commits](socketio/socket.io@2.3.0...2.4.0)

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Author: dependabot[bot]

package-lock.json

@@ -33,7 +33,7 @@
     "express-async-handler": "^1.1.4",
     "jsonwebtoken": "^8.5.1",
     "mongoose": "^5.9.21",
-    "socket.io": "^2.3.0",
+    "socket.io": "^2.4.0",
     "ts-node-dev": "^1.0.0-pre.44",
     "tsc": "^1.20150623.0",
     "typescript": "^3.8.3"