[Checkins] [zopefoundation/Zope] a0319c: Use travis-ci default distribution (now trusty).

[GitHub]

  Branch: refs/heads/travis
  Home:   https://github.com/zopefoundation/Zope
  Commit: a0319cc042ff5b76f9fdee082211b3618fdd5b68
      https://github.com/zopefoundation/Zope/commit/a0319cc042ff5b76f9fdee082211b3618fdd5b68
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-09-09 (Sat, 09 Sep 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Use travis-ci default distribution (now trusty).