[Checkins] [zopefoundation/Zope] bc7ec6: - update to zope.hookable 5.0.1 to fix Python 3.9 ...

[Jens Vagelpohl]

  Branch: refs/heads/issue717-pttales-master
  Home:   https://github.com/zopefoundation/Zope
  Commit: bc7ec65778232fcd0bc6d6054a064d20c8549c65
      https://github.com/zopefoundation/Zope/commit/bc7ec65778232fcd0bc6d6054a064d20c8549c65
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2020-03-27 (Fri, 27 Mar 2020)

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

  Log Message:
  -----------
  - update to zope.hookable 5.0.1 to fix Python 3.9 issues