[docs] [issue1635217] Warn against using requires/provides/obsoletes in setup.py

[Mark Lawrence]

Changes by Mark Lawrence <breamoreboy at yahoo.co.uk>:


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versions: +Python 3.5 -Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue1635217>
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