What's Changed
* Use signature.bind by altescy in https://github.com/altescy/cachestore/pull/26
* Use dill if available by altescy in https://github.com/altescy/cachestore/pull/30
* Check __file__ content by altescy in https://github.com/altescy/cachestore/pull/31
* Bump version number to v0.3.1 by altescy in https://github.com/altescy/cachestore/pull/32
**Full Changelog**: https://github.com/altescy/cachestore/compare/v0.3.0...v0.3.1