use twine check instead of setup.py check

Author: altendky

tox.ini

@@ -39,7 +39,7 @@ deps =
      -r {toxinidir}/dev-requirements.txt
 skip_install = true
 commands =
-    python setup.py check --strict --metadata --restructuredtext
+    twine check --strict
     check-manifest {toxinidir}
     black --check {toxinidir}
     isort --verbose --check-only --diff src tests setup.py