Mpl-playback

**Full Changelog**: https://github.com/ianhi/mpl-playback/compare/0.3.0...0.4.0

**Full Changelog**: https://github.com/ianhi/mpl-playback/compare/0.2.0...0.3.0

What's Changed
* Pretty json + pre-commit by ianhi in https://github.com/ianhi/mpl-playback/pull/10
* Add command line usage + some typing by ianhi in https://github.com/ianhi/mpl-playback/pull/11
* Improve docs by ianhi in https://github.com/ianhi/mpl-playback/pull/15


**Full Changelog**: https://github.com/ianhi/mpl-playback/compare/0.1.3...0.2.0

Fix a typo that made `playback_file` always fail: https://github.com/ianhi/mpl-playback/commit/bcb9c363a5d893d7794b35a93bb58784cd0f70e8