Python version 3.9 was not changed in the last release of 0.17.0. It has now been updated in this
release. Thanks to first time contributors @Azaya89 and @dmiracle; and regular contributors @hoxbro, @maximlt and @amaloney.
Breaking Changes:
- Really drop support for Python 3.9 #1415
Enhancements:
- Naive JIT implementation for cooling #1408