terminated sockets not calling callbacks
On `Ratchet\WebSocket\WsServer;` when a connected client drops the connection (not in a clean way, i.e.: Unplugs computer), my `onClose` function does not get called. Infact, when I use `$conn->send($msg)` the `onError` function is not called, it treats it as if the client was still connected. How can I know when a client drops the connection uncleanly?
