[Checkins] [zopefoundation/Zope] 680521: Use current version of Chameleon.

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Zope
  Commit: 6805216326451a2e340d2c3ef4e087f916f5e36e
      https://github.com/zopefoundation/Zope/commit/6805216326451a2e340d2c3ef4e087f916f5e36e
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-02-20 (Wed, 20 Feb 2019)

  Changed paths:
    M versions-prod.cfg

  Log Message:
  -----------
  Use current version of Chameleon.

Fixes #510.