- Update to 4.0.1:
* Use flit-core for test projects.
* Removed word boundary from INT rule regex.
* Removed Python support for 3.6 and 3.7. The minimal supported version
is 3.8.
* Migrated to pyproject.toml for project configuration.
* Migrated to importlib for language/generator registration/discovery as
setuptools pkg_resources is deprecated and unsupported from Python 3.12.
* Added dependency to `importlib-metadata` backward compatibility
package for Python versions < 3.10.
* Relaxed dependency for click to accept 8.x.
* Use flit for package building and publishing.
- Use build and installer for the test projects so we do not pollute the
build root.