[Checkins] [zopefoundation/persistent] c423e5: Support Python 3.6

[GitHub]

  Branch: refs/heads/py36
  Home:   https://github.com/zopefoundation/persistent
  Commit: c423e5d827c7fa987eb62b0c16668766546d05a8
      https://github.com/zopefoundation/persistent/commit/c423e5d827c7fa987eb62b0c16668766546d05a8
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2017-01-13 (Fri, 13 Jan 2017)

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

  Log Message:
  -----------
  Support Python 3.6