0.20.0

Supported python versions are 3.9 to 3.12.

What's Changed

• Replaced decorator skipUnlessModule by @david-zwicker in #53
• Added pyupgrade to format code by @david-zwicker in #54
• Adjusted to latest changes in py-pde by @david-zwicker in #55
• Moved the polar_coordinates function by @david-zwicker in #56
• Updated black formatter by @david-zwicker in #57
• Allow python versions between 3.9 and 3.12 by @david-zwicker in #58

Full Changelog: 0.19.0...0.20.0