Running `python setup.py` directly as a script is deprecated

[cclauss]

https://setuptools.pypa.io/en/latest/deprecated/commands.html

https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html

toolbelt/tox.ini

Lines 68 to 75 in e543fe5

	python setup.py check -m -r -s
	[testenv:release]
	deps =
	twine >= 1.4.0
	wheel
	commands =
	python setup.py sdist bdist_wheel