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**Release breaks backward compatibility!**
* Bump major dependencies: `PyYAML>=6,<7` `Click>=8,<9` (192) by pilosus
* `Marshmallow` integration supports only v3.0.0 and later (192) by pilosus
* Move to `pyproject.toml` for packaging (193) by pilosus
* Raise Python requirement to `>=3.7` (193) by pilosus