title: Does requests_cache automatically update cache on update of info?
body: <p>I have a very unreliable API that I request using Python. I have been thinking about using <a href="https://github.com/reclosedev/requests-cache" rel="nofollow">requests_cache</a> and setting <code>expire_after</code> to be 999999999999 like I have seen other people do.
  The only problem is, I do not know if when the API works again, that if the data is updated. If requests_cache will automatically auto-update and delete the old entry.</p>
  
  <p>I have tried reading the docs but I cannot really see this anywhere.</p>