Not much about SuchTree itself has changed, but the build system has been completely overhauled.
* Migrated build and unit tests from TravisCI to GitHub Actions
* Wheels for Linux on amd64 and MacOS on Intel silicon are now automatically built using [`cibuildwheel`](https://github.com/pypa/cibuildwheel)
* Dependencies should now be identified and installed correctly
* Various minor cosmetic fixes