Merge pull request #331 from twm/prep-for-release

Prep for 21.5.0 release

Author: twm

MANIFEST.in

@@ -7,8 +7,7 @@ prune docs/_build
 prune docs/html
 
 exclude tox.ini
-exclude tox2travis.py
-exclude .travis.yml
+exclude .github
 exclude .readthedocs.yml
 
 # This directory will be empty at release time.