[Checkins] [zopefoundation/DocumentTemplate] 623ead: - re-do Travis CI config

[Jens Vagelpohl]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/DocumentTemplate
  Commit: 623ead0559e5f070dcaac8bedf1e0b4ded78b7f7
      https://github.com/zopefoundation/DocumentTemplate/commit/623ead0559e5f070dcaac8bedf1e0b4ded78b7f7
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2019-04-14 (Sun, 14 Apr 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  - re-do Travis CI config