Log Message:
py-cachelib: updated to 0.2.0

Version 0.2.0

Support for Python 2 has been dropped. Only Python 3.6 and above are supported.
Fix FileSystemCache.set incorrectly considering value overrides on existing keys \ 
as new cache entries.
SimpleCache and FileSystemCache first remove expired entries, followed by older \ 
entries, when cleaning up.
Fix problem where file count was not being updated in FileSystemCache.get and \ 
FileSystemCache.has after removals.
When attempting to access non-existent entries with Memcached, these will now be \ 
initialized with a given value delta.