[Checkins] [zopefoundation/ExtensionClass] 3c8559: Add support for Python 3.9 (#22)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/ExtensionClass
  Commit: 3c8559c5c34c3d701584430c4e5e7b1369f98e86
      https://github.com/zopefoundation/ExtensionClass/commit/3c8559c5c34c3d701584430c4e5e7b1369f98e86
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-09-30 (Wed, 30 Sep 2020)

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

  Log Message:
  -----------
  Add support for Python 3.9 (#22)