[Checkins] [zopefoundation/RestrictedPython] 547cf2: Fix Python versions.

[Michael Howitz]

  Branch: refs/heads/fix-ci
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: 547cf2fdfe56a2a978449373049c9f5195676545
      https://github.com/zopefoundation/RestrictedPython/commit/547cf2fdfe56a2a978449373049c9f5195676545
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-09-02 (Mon, 02 Sep 2019)

  Changed paths:
    M tox.ini

  Log Message:
  -----------
  Fix Python versions.