[Checkins] [zopefoundation/zopetoolkit] a6c4f9: Update to newest versions (Python 3 only).

[Michael Howitz]

  Branch: refs/heads/new-versions
  Home:   https://github.com/zopefoundation/zopetoolkit
  Commit: a6c4f92918c6dda692f69bce5c7b464c690e5a13
      https://github.com/zopefoundation/zopetoolkit/commit/a6c4f92918c6dda692f69bce5c7b464c690e5a13
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-09-24 (Thu, 24 Sep 2020)

  Changed paths:
    M ztk-versions.cfg

  Log Message:
  -----------
  Update to newest versions (Python 3 only).