0.4.0

Added

• Snapshot can be created from and converted to a GSD HOOMD frame.
• Package version is embedded in __version__.

Changed

• Python 3.11 is supported and tested.
• Code style is enforced using black and flake8. Developers should install
  requirements-dev.txt and configure pre-commit.
• Classes are broken into modules for readability. The user API does not change.
• NumPy arrays use float and int as data types instead of specified precision.