[Checkins] [zopefoundation/Zope] e63cb7: Fix the maximum version now Zope 5 is released.

[Michael Howitz]

  Branch: refs/heads/fix-max-version
  Home:   https://github.com/zopefoundation/Zope
  Commit: e63cb78542d59c0110100ef32bac097d3de9223b
      https://github.com/zopefoundation/Zope/commit/e63cb78542d59c0110100ef32bac097d3de9223b
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-10-12 (Mon, 12 Oct 2020)

  Changed paths:
    M docs/maintenance.rst
    M util.py
    M versions-prod.cfg

  Log Message:
  -----------
  Fix the maximum version now Zope 5 is released.