[Checkins] [zopefoundation/Zope] 86ec8f: Add a note about ZCatalog 6+.

[Michael Howitz]

  Branch: refs/heads/4.x
  Home:   https://github.com/zopefoundation/Zope
  Commit: 86ec8f5404a74758bbcc58029bf6cd6a0e61b9ee
      https://github.com/zopefoundation/Zope/commit/86ec8f5404a74758bbcc58029bf6cd6a0e61b9ee
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-10-08 (Thu, 08 Oct 2020)

  Changed paths:
    M versions-prod.cfg

  Log Message:
  -----------
  Add a note about ZCatalog 6+.