[Checkins] [zopefoundation/DocumentTemplate] 3f8f45: - try to fix six version conflict

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/DocumentTemplate
  Commit: 3f8f45e771f7ee5e2a797b9b09a6882b1d3561f3
      https://github.com/zopefoundation/DocumentTemplate/commit/3f8f45e771f7ee5e2a797b9b09a6882b1d3561f3
  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