Update to socket v4

[wilianmaique]

many things have been improved, what do you think about updating to the latest?

https://socket.io/docs/v4/server-api/

[marcosmarcolin]

#262

[binemmanuel]

We don't have a choice but to make the upgrade ourselves and create a PR since our applications depend on it

[wilianmaique]

We don't have a choice but to make the upgrade ourselves and create a PR since our applications depend on it

I don't have that much knowledge, but I could run tests etc, report bugs etc, someone needs to do this, and make it open source, it's very good

[PhilLehmann]

I would definetly be interested. This would enable me to use ngx-socket-io in the latest version, which is required when you want to use the latest angular version.

For now, I will just use the original library socket.io-client as a fallback, but i would definetly support (beta) testing if you PR phpsocket.io with socket.io v4 support.