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Maintenance release v2.3

Feature fixed on v2.3:
  * fix compatibility with dnspython 2.0 (#11)
  * fix issue when trying to apply DNS update on secondary server (thanks Sebastian Koechlin)
  * fix debug message when CNAME was not found
  * fix test chain assertion (a chain contains more than 1 certificate)

Feature added:
  * skip already validated authorization challenge

Continuous Integration improvement:
  * Debian Stretch tests were using Debian Jessie image
  * Enable Docker build uses [BUILDKIT](
    and the `overlay2` filesystem driver

  * the .gitignore file has been simplified