[Checkins] [zopefoundation/zope.authentication] a21bf0: Add support for Python 3.7; drop 3.3

[GitHub]

  Branch: refs/heads/add37drop33
  Home:   https://github.com/zopefoundation/zope.authentication
  Commit: a21bf05a3494b6b444ed466db8a319020e2e545f
      https://github.com/zopefoundation/zope.authentication/commit/a21bf05a3494b6b444ed466db8a319020e2e545f
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2018-08-24 (Fri, 24 Aug 2018)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M setup.py
    M tox.ini

  Log Message:
  -----------
  Add support for Python 3.7; drop 3.3

Builds have been failing on 3.3 recently.

Also drop python setup.py test



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