leave another note in Makefile to help remember using virtualenv

Author: Byron

Diff for: Makefile

@@ -17,6 +17,6 @@ release: clean
 force_release: clean
 	# IF we're in a virtual environment, add build tools
 	test -z "$$VIRTUAL_ENV" || pip install -U build twine
-	python3 -m build --sdist --wheel
+	python3 -m build --sdist --wheel || echo "Use a virtual-env with 'python -m venv env && source env/bin/activate' instead"
 	twine upload dist/*
 	git push --tags origin main