[Checkins] [zopefoundation/AccessControl] 4bb5c1: modify travis.ci config

[GitHub]

  Branch: refs/heads/flake8
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 4bb5c18746e970892948ce6193de4d986abda033
      https://github.com/zopefoundation/AccessControl/commit/4bb5c18746e970892948ce6193de4d986abda033
  Author: Alexander Loechel <Alexander.Loechel at lmu.de>
  Date:   2017-05-03 (Wed, 03 May 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  modify travis.ci config