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   Update to 4.1.0. From the git log:

   - apparently the Let's Encrypt test server is rejecting example.com emails
   - added official python 3.7 support in setup.py
   - fixed #226, start using POST-as-GET for GET requests
   - fixed additional POST-as-GET
   - addresses #205, a situation where polling may hang indefinitely
   - Also accept critical SAN extensions.
   - fixed #222, we shouldn't delete the challenge files on errors, but we
     should clean them up on success

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