build(deps-dev): bump docformatter from 1.4 to 1.5.1 (#20)

Bumps [docformatter](https://github.com/PyCQA/docformatter) from 1.4 to 1.5.1.
- [Release notes](https://github.com/PyCQA/docformatter/releases)
- [Changelog](https://github.com/PyCQA/docformatter/blob/master/CHANGELOG.md)
- [Commits](PyCQA/docformatter@v1.4...v1.5.1)

---
updated-dependencies:
- dependency-name: docformatter
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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