[Checkins] [zopefoundation/RestrictedPython] 270076: Try to fix docs TOXENV test on AppVeyor.

[Michael Howitz]

  Branch: refs/heads/fix-ci
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: 27007605599388b3760c43d1ae1e5c2d813ad7c9
      https://github.com/zopefoundation/RestrictedPython/commit/27007605599388b3760c43d1ae1e5c2d813ad7c9
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-09-02 (Mon, 02 Sep 2019)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  Try to fix docs TOXENV test on AppVeyor.