[Checkins] [zopefoundation/Zope] 6ba79f: Prevent updating to Python 3 only versions. (#783)

[Michael Howitz]

  Branch: refs/heads/4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6ba79f10346137916a13cebf676904b9a3d9d96a
      https://github.com/zopefoundation/Zope/commit/6ba79f10346137916a13cebf676904b9a3d9d96a
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-02-11 (Tue, 11 Feb 2020)

  Changed paths:
    M docs/maintenance.rst

  Log Message:
  -----------
  Prevent updating to Python 3 only versions. (#783)