Merge branch '3-bug-in-react_room_messages' into 'master'

Resolve "Bug in "react_room_messages""

Closes #3

See merge request !3

mytrix.py

@@ -181,6 +181,9 @@ class Matrix:
             limit = self.sync_limit
         if from_ is None:
             from_ = self._from_cache.get(room, None)
+            if from_ is None:
+                dir_ = "b"
+
 
         endpoint = "/r0/rooms/%s/messages" % (room,)