What's Changed
* Add contributing docs (CONTRIBUTING.md) and update the README.md by matthuska in https://github.com/rki-mf1/breakfast/pull/7
* Feature/speedup submat batches by denisbeslic tweaked by matthuska in https://github.com/rki-mf1/breakfast/pull/9
* Create output cache dir if it doesn't exist. by matthuska in https://github.com/rki-mf1/breakfast/pull/15
* Add more tests for filtering mutations, more specific var-type options, option for controlling number of parallel threads (--jobs) by matthuska in https://github.com/rki-mf1/breakfast/pull/14
* Add nextclade DNA test data denisbeslic
**Full Changelog**: https://github.com/rki-mf1/breakfast/compare/v0.3.3...v0.4.0