Creates a voice websocket for the :class:`VoiceClient`.

async def from_client(cls, client, *, resume=False):
        """Creates a voice websocket for the :class:`VoiceClient`."""
        gateway = 'wss://' + client.endpoint + '/?v=4'
        ws = await websockets.connect(gateway, loop=client.loop, klass=cls, compression=None)
        ws.gateway = gateway
        ws._connection = client
        ws._max_heartbeat_timeout = 60.0

        if resume:
            await ws.resume()
        else:
            await ws.identify()

        return ws