[Checkins] [zopefoundation/Zope] b2268b: Add 2.13.27 release.

[GitHub]

  Branch: refs/heads/gh-pages
  Home:   https://github.com/zopefoundation/Zope
  Commit: b2268b05012bfbe941dac3501d6fa49c9ad3c174
      https://github.com/zopefoundation/Zope/commit/b2268b05012bfbe941dac3501d6fa49c9ad3c174
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-01-27 (Sat, 27 Jan 2018)

  Changed paths:
    M README.md
    M build_index.sh
    A releases/2.13.27/requirements.txt
    A releases/2.13.27/versions-prod.cfg

  Log Message:
  -----------
  Add 2.13.27 release.