Bump black from 20.8b1 to 22.8.0 (#17)

Bumps [black](https://github.com/psf/black) from 20.8b1 to 22.8.0.
- [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/22.8.0)

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

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pyproject.toml

@@ -16,7 +16,7 @@ python = "^3.7"
 PyGObject = "^3.38.0"
 
 [tool.poetry.dev-dependencies]
-black = "^20.8b1"
+black = "^22.8"
 flake8 = "^5.0.4"
 mypy = "^0.971"
 pre-commit = "^2.20.0"