Please update ITransport interface

[passby6someone]

I am using "colyseus.js": "^0.14.13".

When the player disconnects from the network, execute room.send(...) console will log "WebSocket is already in CLOSING or CLOSED" error.

For catching this error and close game. I have tried to use room.onError, room.connection.events.onclose and window.onerror, they're not working.

I found that error occurred in src/transport/WebSocketTransport.ts

const _send = ws.send;
ws.send = function (data: ArrayBuffer) {
    if (ws.readyState == 1) {
        bytesSent += data.byteLength;
    }
    _send.call(ws, data);
}

Then I found this issue close not called if a client disconnects due to network failure in websockets.

So I have to check websockets.readyState before room.send everytime.

I found ws object is exposed in WebSocketTransport, but ITransport interface not define this type.

Please update ITransport interface for checking ws connection status.

PS: I am not a native English speaker. If there are any grammar errors, please forgive me