- add pyproject.toml to follow PEP 518 compliance and install Cython before building (Author Plantain, https://github.com/tilery/python-vtzero/pull/14)
- update minimal Cython version to `>=0.29.23` (https://github.com/tilery/python-vtzero/pull/16)
- remove `pkg_resources` to increase performance when loading the library (https://github.com/tilery/python-vtzero/pull/18)