[core-workflow] Looking for reviewers on a PR to add a check for whitespace

[Brett Cannon]

https://github.com/python/core-workflow/issues/3 is tracking adding a check
for proper whitespace in PRs as we had that on hg.python.org but we are
missing it on GitHub. I have a PR at
https://github.com/python/cpython/pull/2367 that I think does the right
thing, but I would appreciate a quick review to make sure I didn't miss
anything since this will block PRs if I get it wrong. :)
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