[Checkins] [zopefoundation/Zope] 573162: Update documentation about migration

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 5731623ce680eeea544606f0d4753be07e46a716
      https://github.com/zopefoundation/Zope/commit/5731623ce680eeea544606f0d4753be07e46a716
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-09-21 (Thu, 21 Sep 2017)

  Changed paths:
    M docs/WHATSNEW.rst

  Log Message:
  -----------
  Update documentation about migration