[docs] [issue25874] Add notice that XP is not supported on Python 3.5+

[SilentGhost]

SilentGhost added the comment:

This seems fully covered in the What's new for 3.5: https://docs.python.org/3/whatsnew/3.5.html#unsupported-operating-systems

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nosy: +SilentGhost
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25874>
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