[Checkins] [zopefoundation/zope.security] 5ae244: Update to current Python versions.

[Michael Howitz]

  Branch: refs/heads/update
  Home:   https://github.com/zopefoundation/zope.security
  Commit: 5ae244584456202fd6033a2b496b1b5b965159af
      https://github.com/zopefoundation/zope.security/commit/5ae244584456202fd6033a2b496b1b5b965159af
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-04-02 (Tue, 02 Apr 2019)

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

  Log Message:
  -----------
  Update to current Python versions.

Additionally we have to pin an older `Sphinx` version to keep supporting
Python 2.