Python formatting

bookwyrm/activitystreams.py

@@ -20,7 +20,9 @@ class ActivityStream(RedisStore):
 
     def unread_id(self, user):
         """the redis key for this user's unread count for this stream"""
-        return "{}-unread".format(self.stream_id(user))  # pylint: disable=consider-using-f-string
+        return "{}-unread".format(
+            self.stream_id(user)
+        )  # pylint: disable=consider-using-f-string
 
     def get_rank(self, obj):  # pylint: disable=no-self-use
         """statuses are sorted by date published"""