[issue15957] README.txt points to broken "contributing" url in python wiki

[Roundup Robot]

Roundup Robot added the comment:

New changeset d328dcd07449 by Éric Araujo in branch 'python3':
Merge fixes for #16107 and #15957 from default
http://hg.python.org/distutils2/rev/d328dcd07449

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