Log Message:
py-flask-caching: updated to 1.9.0

Version 1.9.0

- Add an option to include the functions source code when generating the cache
  key.
- Add an feature that allows one to completely control the way how cache keys
  are generating. For example, one can now implement a function that generates
  cache the keys based on the POST-based requests.
- Fix the cache backend naming collisions by renaming them from ``simple`` to
  ``simplecache``, ``null`` to ``nullcache`` and ``filesystem`` to
  ``filesystemcache``.
- Explicitly pass the ``default_timeout`` to ``RedisCache`` from
  ``RedisSentinelCache``.
- Use ``os.replace`` instead of werkzeug's ``rename`` due to Windows raising an
  ``OSError`` if the dst file already exist.
- Documentation updates and fixes.