[Checkins] [zopefoundation/Zope] 08c9d6: - add link to requires.io [ci skip]

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 08c9d6c5071e2333d18bdf8d5e5d9c18162bdfe5
      https://github.com/zopefoundation/Zope/commit/08c9d6c5071e2333d18bdf8d5e5d9c18162bdfe5
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-11-27 (Wed, 27 Nov 2019)

  Changed paths:
    M docs/maintenance.rst

  Log Message:
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  - add link to requires.io [ci skip]