Bump socket.io-client from 3.0.3 to 3.0.4

Bumps [socket.io-client](https://github.com/socketio/socket.io-client) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/socketio/socket.io-client/releases)
- [Changelog](https://github.com/socketio/socket.io-client/blob/master/CHANGELOG.md)
- [Commits](socketio/socket.io-client@3.0.3...3.0.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

package.json

@@ -38,7 +38,7 @@
     "mz": "^2.7.0",
     "relative-date": "^1.1.3",
     "socket.io": "^3.0.3",
-    "socket.io-client": "^3.0.3",
+    "socket.io-client": "^3.0.4",
     "vue": "2.6.12",
     "vue-router": "^3.4.9",
     "vue-server-renderer": "2.6.12",