[Checkins] [zopefoundation/Zope] 7c65ca: Add preliminary support for Python 3.8. (#477)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 7c65ca2d3acf574aa74065f6545124882441bb90
      https://github.com/zopefoundation/Zope/commit/7c65ca2d3acf574aa74065f6545124882441bb90
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-02-09 (Sat, 09 Feb 2019)

  Changed paths:
    M .travis.yml
    M CHANGES.rst
    M buildout.cfg
    M setup.py
    M src/OFS/tests/testObjectManager.py
    M tox.ini
    M versions-prod.cfg

  Log Message:
  -----------
  Add preliminary support for Python 3.8. (#477)

* Add preliminary support for Python 3.8. as of 3.8.0a1 is released.
* Fix deprecation warning.