title: How to detect if a message is edited?
body: <p>I am intending for my bot to allow only "ew" to be sent in chat. I have resolved majority of the work-arounds, however, there is one I can't resolve independently. When someone posts "ew" in chat and then edits the message to something else, it remains like that without being deleted.</p>
  
  <p>How could I resolve this?</p>