boto/boto — pull request #2286 by Ivoz (2014-05-25 21:38:57+00:00)
Title: Update the wheel to be python 2 compatible only.

Indicating it's universal will imply that its also compatible with python 3 and allow it to be mistakenly installed on 3.xs.

The `python-tag` var is available from 0.23

Also see http://wheel.readthedocs.org/en/latest/#defining-the-python-version