build: use twine to check the package

Author: nedbat

setup.py

@@ -62,6 +62,7 @@ def read(*names, **kwargs):
             re.M | re.S,
         ).sub('', read('README.rst'))
     ),
+    long_description_content_type='text/x-rst',
     author='Ned Batchelder',
     author_email='[email protected]',
     url='https://github.com/nedbat/django_coverage_plugin',

tox.ini

@@ -60,9 +60,11 @@ deps =
     docutils
     check-manifest
     readme-renderer
+    twine
 
 commands =
-    python setup.py check --strict --metadata --restructuredtext
+    python setup.py -q sdist
+    twine check dist/*
     check-manifest {toxinidir}
 
 [testenv:doc]