Bump black from 19.10b0 to 20.8b1

See merge request !89

Bump matplotlib from 3.3.0 to 3.3.1

See merge request !81

Bumps [black](https://github.com/psf/black) from 19.10b0 to 20.8b1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/master/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

Sphinx

Closes #96

See merge request !84

doc-string doc of test functionality

See merge request !78

Bump scikit-learn from 0.23.1 to 0.23.2

See merge request !79

refactored drop_flags to to_drop as former implies a boolen value, but a...

Closes #33

See merge request !53