Do not invoke setup.py directly

- It is not recommended to invoke ``setup.py`` directly, instead opting for ``python -m build`` for the commands in this commit (see: https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html)
- Add newsfragment for ethereum#70

Makefile

@@ -28,7 +28,7 @@ clean-pyc:
 	find . -name '__pycache__' -exec rm -rf {} +
 
 lint:
-	tox -elint
+	tox -e lint
 
 lint-roll:
 	isort --recursive <MODULE_NAME> tests
@@ -83,11 +83,11 @@ release: check-bump clean
 	git config commit.gpgSign true
 	bumpversion $(bump)
 	git push upstream && git push upstream --tags
-	python setup.py sdist bdist_wheel
+	python -m build
 	twine upload dist/*
 	git config commit.gpgSign "$(CURRENT_SIGN_SETTING)"
 
 
 dist: clean
-	python setup.py sdist bdist_wheel
+	python -m build
 	ls -l dist

newsfragments/70.internal.rst

@@ -0,0 +1 @@
+Do not invoke ``setup.py`` directly. Minor cleanup and refactors in newsfragment ``README.md`` and newsfragment validation. Minot cleanup in ``Makefile``.