0.16.0

This is CacheLib's 0.16.0 feature release. A feature release may include new features, remove previously deprecated code, add new deprecations, or introduce potentially breaking changes. We encourage everyone to upgrade, and to use a tool such as pip-tools to pin all dependencies and control upgrades. Test with warnings treated as errors to be able to adapt to deprecation warnings early.

PyPI: https://pypi.org/project/CacheLib/0.16.0/
Changes: https://cachelib.readthedocs.io/en/stable/changes/#version-0.16.0
Milestone: https://github.com/pallets-eco/cachelib/milestone/3?closed=1

• Change FileSystemCache default hash method to hashlib.sha256
  because hashlib.md5 is not available in FIPs builds. #500
• Ping backends servers on init to ensure they are reachable. #503
• Fix Memcached with python-memcached client returned None
  instead of True when flush_all was successful. #504
• Add ignore_delete_many_errors parameter to all cache backends to allow
  users to control whether delete_many() raises a RuntimeError if any key fails to delete. #505

Full Changelog: 0.15.4...0.16.0