[Checkins] [zopefoundation/Zope] f97b1c: Update to Zope2 4.0b1 release.

[GitHub]

  Branch: refs/heads/update-to-zope2-release
  Home:   https://github.com/zopefoundation/Zope
  Commit: f97b1cf6d1c0b6594b78b79f3dae9aae39fddfb2
      https://github.com/zopefoundation/Zope/commit/f97b1cf6d1c0b6594b78b79f3dae9aae39fddfb2
  Author: Michael Howitz <mh at gocept.com>
  Date:   2017-09-18 (Mon, 18 Sep 2017)

  Changed paths:
    M requirements-full.txt
    M versions-prod.cfg

  Log Message:
  -----------
  Update to Zope2 4.0b1 release.

Fixes #183.