[Checkins] [zopefoundation/Zope] 8397b3: - use Chameleon 3.8

[Jens Vagelpohl]

  Branch: refs/heads/issue_846_2
  Home:   https://github.com/zopefoundation/Zope
  Commit: 8397b3b19cb4545593bcde1aa8957b8a5be89eac
      https://github.com/zopefoundation/Zope/commit/8397b3b19cb4545593bcde1aa8957b8a5be89eac
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2020-06-26 (Fri, 26 Jun 2020)

  Changed paths:
    M constraints.txt
    M requirements-full.txt
    M versions-prod.cfg

  Log Message:
  -----------
  - use Chameleon 3.8