Update release instructions

Author: amorison

Makefile

@@ -66,6 +66,6 @@ else
 	$(PY) -m pip install -U --user pip build setuptools twine wheel
 	$(PY) -m build
 	$(PY) -m twine upload dist/*
-	-rm -rf build/ dist/
+	-rm -rf dist/
 endif
 endif

docs/sources/maintainers.rst

@@ -30,7 +30,7 @@ Releasing on PyPI is a two steps process:
 
 ::
 
-    % python3 setup.py sdist bdist_wheel
+    % python3 -m build
     % python3 -m twine upload dist/*
-    % rm -rf build/ dist/
+    % rm -rf dist/