[Checkins] [zopefoundation/Zope] d60997: - update master versions

[Jens Vagelpohl]

  Branch: refs/heads/gh-pages
  Home:   https://github.com/zopefoundation/Zope
  Commit: d60997f761a5d331665032ce97f986533221cbb1
      https://github.com/zopefoundation/Zope/commit/d60997f761a5d331665032ce97f986533221cbb1
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-04-25 (Thu, 25 Apr 2019)

  Changed paths:
    M releases/master/constraints.txt
    M releases/master/requirements-full.txt
    M releases/master/versions-prod.cfg
    M releases/master/versions.cfg

  Log Message:
  -----------
  - update master versions