[Checkins] [zopefoundation/Zope] 81081e: Add preliminary support for Python 3.9a4. (#784)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 81081e9cd232a6bf9d981d139182f1af89ac0459
      https://github.com/zopefoundation/Zope/commit/81081e9cd232a6bf9d981d139182f1af89ac0459
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-06 (Fri, 06 Mar 2020)

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

  Log Message:
  -----------
  Add preliminary support for Python 3.9a4. (#784)

As 3.9 is in its early alpha stage do not yet declare supporting it.

Co-authored-by: Jens Vagelpohl <jens at netz.ooo>