build-system floors out of date

[Jeremy Paige]

It looks like this project recently moved to the pyproject.toml project table (#27) without updating the versions of setuptools it is compatible with, and this leads to distributions missing metadata in some cases.

What can happen now:

❯ pip list
Package    Version
---------- -------
pip        21.2.4
setuptools 36.7.0
wheel      0.28.0
❯ python setup.py sdist bdist_wheel
running sdist
...
❯ ls dist/
total 80
-rw-r--r--  1 jeremyp  staff    27K Oct 25 13:05 UNKNOWN-0.4.2-py3-none-any.whl
-rw-r--r--  1 jeremyp  staff   8.2K Oct 25 13:05 UNKNOWN-0.4.2.tar.gz