[Checkins] [zopefoundation/Zope] a77b0c: Add preliminary support for Python 3.9a3.

[Michael Howitz]

  Branch: refs/heads/py39
  Home:   https://github.com/zopefoundation/Zope
  Commit: a77b0c813da7cf9b5673522ca3c9817311a9f94c
      https://github.com/zopefoundation/Zope/commit/a77b0c813da7cf9b5673522ca3c9817311a9f94c
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-11 (Tue, 11 Feb 2020)

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

  Log Message:
  -----------
  Add preliminary support for Python 3.9a3.