Fix errors in examples

examples/removebot.py

@@ -5,7 +5,7 @@ def on_message(event):
     # We can only kick people from group chats, so no need to try if it's a user chat
     if not isinstance(event.thread, fbchat.Group):
         return
-    if message.text == "Remove me!":
+    if event.message.text == "Remove me!":
         print(f"{event.author.id} will be removed from {event.thread.id}")
         event.thread.remove_participant(event.author.id)