[Checkins] [zopefoundation/DocumentTemplate] a200e0: - try to fix six version conflict

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/DocumentTemplate
  Commit: a200e093ec332772e92fde8b25280ca9f877d6cc
      https://github.com/zopefoundation/DocumentTemplate/commit/a200e093ec332772e92fde8b25280ca9f877d6cc
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2017-11-03 (Fri, 03 Nov 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  - try to fix six version conflict