[issue25704] Update the devguide to 3.5

[Roundup Robot]

Roundup Robot added the comment:

New changeset 32545ee8d673 by Berker Peksag in branch 'default':
Issue #25704: Update Python version to 3.5 where appropriate
https://hg.python.org/devguide/rev/32545ee8d673

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nosy: +python-dev

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<http://bugs.python.org/issue25704>
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