[Checkins] [zopefoundation/Zope] 6bbd2d: Update zope.hookable to support newer setuptools v...

[Michael Howitz]

  Branch: refs/heads/new-setuptools-support
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6bbd2dd5d67f356ff070b6bd5365cda73205f06d
      https://github.com/zopefoundation/Zope/commit/6bbd2dd5d67f356ff070b6bd5365cda73205f06d
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-16 (Mon, 16 Mar 2020)

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

  Log Message:
  -----------
  Update zope.hookable to support newer setuptools versions.