[Checkins] [zopefoundation/zopetoolkit] c40602: Try out preliminary support for Python 3.9 (#39)

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zopetoolkit
  Commit: c40602e00889411d3ffff2080ac24e393cf33a59
      https://github.com/zopefoundation/zopetoolkit/commit/c40602e00889411d3ffff2080ac24e393cf33a59
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-06 (Fri, 06 Mar 2020)

  Changed paths:
    M .travis.yml
    R bootstrap.py
    M ztk-versions.cfg

  Log Message:
  -----------
  Try out preliminary support for Python 3.9 (#39)

$ python bootstrap.py no longer works in Python 3.9