[Checkins] [zopefoundation/zopetoolkit] 474438: $ python bootstrap.py no longer works in Python 3.9

[Michael Howitz]

  Branch: refs/heads/py39
  Home:   https://github.com/zopefoundation/zopetoolkit
  Commit: 474438ef7a72d6abeb87df611cacd48d7528726c
      https://github.com/zopefoundation/zopetoolkit/commit/474438ef7a72d6abeb87df611cacd48d7528726c
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-14 (Fri, 14 Feb 2020)

  Changed paths:
    M .travis.yml
    R bootstrap.py

  Log Message:
  -----------
  $ python bootstrap.py no longer works in Python 3.9