[issue8999] Add Mercurial support to patchcheck

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Adding nosy from the other patchcheck bug, hope it doesn’t annoy anyone.

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nosy: +belopolsky, brett.cannon, mark.dickinson, pitrou

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<http://bugs.python.org/issue8999>
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