[Checkins] [zopefoundation/Zope] 6decaf: Allow to use the required version.

[GitHub]

  Branch: refs/heads/lines-property
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6decaf471134165f7e2317c3182ed0ec953a6fcf
      https://github.com/zopefoundation/Zope/commit/6decaf471134165f7e2317c3182ed0ec953a6fcf
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-04-20 (Fri, 20 Apr 2018)

  Changed paths:
    M .travis.yml
    M versions-prod.cfg

  Log Message:
  -----------
  Allow to use the required version.