Merge pull request #224

* fix unsubscribe_topics() typo

Author: charlesmadere

twitchio/ext/pubsub/pool.py

@@ -81,7 +81,7 @@ async def unsubscribe_topics(self, topics: List[Topic]):
 
         """
         for node, vals in itertools.groupby(topics, lambda t: self._topics[t]):
-            await node.unsubscribe_topics(vals)
+            await node.unsubscribe_topic(vals)
             if not node.topics:
                 await node.disconnect()
                 self._pool.remove(node)