Fix errors in examples

examples/fetch.py

@@ -65,5 +65,5 @@ print("thread's name: {}".format(thread.name))
 images = list(thread.fetch_images(limit=20))
 for image in images:
     if isinstance(image, fbchat.ImageAttachment):
-        url = c.fetch_image_url(image.id)
+        url = client.fetch_image_url(image.id)
         print(url)

examples/keepbot.py

@@ -80,7 +80,7 @@ def on_person_removed(sender, event: fbchat.PersonRemoved):
         return
     if event.author.id != session.user.id:
         print(f"{event.removed.id} got removed. They will be re-added")
-        event.thread.add_participants([removed.id])
+        event.thread.add_participants([event.removed.id])
 
 
 # Login, and start listening for events

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)