Changed join on invite logic and added debug print. Fixes #5 (hopefully).

bot.py

@@ -117,9 +117,7 @@ class Bot:
                 traceback.print_exc(file=sys.stderr)
 
     async def invite_cb(self, room, event):
-        if not self.join_on_invite or self.is_owner(event):
-            return
-
+        if self.join_on_invite or self.is_owner(event):
             for attempt in range(3):
                 result = await self.client.join(room.room_id)
                 if type(result) == JoinError:
@@ -128,6 +126,8 @@ class Bot:
                     )
                 else:
                     break
+        else:
+            print('Received invite event, but not joining as sender is not owner or bot not configured to join on invte.')
 
     def load_module(self, modulename):
         try: