Handle broken aiohttp websocket in chat bot client

It turns out that aiohttp WebSocket code does not recognize if the
underlying connection is broken:
aio-libs/aiohttp#2309
As a twitch client we know we'll at minimum receive a PING request every
5 minutes even if no other channel updates are happening:
https://dev.twitch.tv/docs/irc/#keepalive-messages
(I tested this and saw every a ping request always happened between
every 4min 1sec to 4min 51sec)

If we miss a PING and fail to respond twitch considers the connection
closed. Thus we can add a timeout to our websocket receive() call and if
we've heard nothing in over 5 minutes our connection is broken and we
should perform a reconnect. This has been tested running the bot, and
then trying 3 different types of connection breaking:
1) Disabling the network interface on my computer for 5 minutes
2) Suspending laptop and resuming later
3) Dropping related active NAT state on router (similar to rebooting router)

twitchAPI/chat/__init__.py

@@ -894,7 +894,18 @@ async def __task_receive(self):
                 'USERSTATE': self._handle_user_state
             }
             while not self.__connection.closed:
-                message = await self.__connection.receive()
+                try:  # At minimum we should receive a PING request just under every 5 minutes
+                    message = await self.__connection.receive(timeout=5*60)
+                except asyncio.TimeoutError:
+                    self.logger.warning(f"Reached timeout for websocket receive, will attempt a reconnect")
+                    if self.__running:
+                        try:
+                            await self._handle_base_reconnect()
+                        except TwitchBackendException:
+                            self.logger.exception('Connection to chat websocket lost and unable to reestablish connection!')
+                            break
+                    else:
+                        break
                 if message.type == aiohttp.WSMsgType.TEXT:
                     messages = message.data.split('\r\n')
                     for m in messages: