[Checkins] [zopefoundation/RestrictedPython] c54dbf: Test on Python 3.9

[Michael Howitz]

  Branch: refs/heads/fix-193
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: c54dbf942d0882f7bd8fc94c12922ca25080d84b
      https://github.com/zopefoundation/RestrictedPython/commit/c54dbf942d0882f7bd8fc94c12922ca25080d84b
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-31 (Tue, 31 Mar 2020)

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

  Log Message:
  -----------
  Test on Python 3.9