⬆️ Bump black from 19.10b0 to 21.11b1

Bumps [black](https://github.com/psf/black) from 19.10b0 to 21.11b1.
- [Release notes](https://github.com/psf/black/releases)
- [Changelog](https://github.com/psf/black/blob/main/CHANGES.md)
- [Commits](https://github.com/psf/black/commits)

---
updated-dependencies:
- dependency-name: black
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements-test.txt

@@ -7,4 +7,4 @@ pytest-flake8==1.0.2
 pytest-pep8==1.0.6
 coverage==5.3
 coveralls==2.1.2
-black==19.10b0
+black==21.11b1