Fix broken/lost stuff after rebasing PR551.

Author: ionelmc

MANIFEST.in

@@ -79,15 +79,13 @@ commands =
 [testenv:check]
 deps =
     docutils
-    check-manifest
+    twine
+    build
     pre-commit
-    readme-renderer
-    pygments
-    isort
 skip_install = true
 commands =
-    python setup.py check --strict --metadata --restructuredtext
-    check-manifest .
+    python -m build
+    twine check --strict dist/*
     pre-commit run --all-files --show-diff-on-failure
 
 [testenv:docs]