Update channel.py

fix formatting?

Author: ngieseker

stream_chat/async_chat/channel.py

@@ -195,7 +195,9 @@ async def hide(self, user_id: str) -> StreamResponse:
     async def show(self, user_id: str) -> StreamResponse:
         return await self.client.post(f"{self.url}/show", data={"user_id": user_id})
 
-    async def mute(self, user_id: str, expiration: Optional[int] = None) -> StreamResponse:
+    async def mute(
+        self, user_id: str, expiration: Optional[int] = None
+    ) -> StreamResponse:
         params: Dict[str, Union[str, int]] = {
             "user_id": user_id,
             "channel_cid": self.cid,