[Checkins] [zopefoundation/AccessControl] 469a54: Add a pure Python 2.7 build to .travis.yml.

[GitHub]

  Branch: refs/heads/rotonen-purepython
  Home:   https://github.com/zopefoundation/AccessControl
  Commit: 469a543ebe237b5068540fa0b283a2d0d84c53a1
      https://github.com/zopefoundation/AccessControl/commit/469a543ebe237b5068540fa0b283a2d0d84c53a1
  Author: Joni Orponen <joni.orponen at gmail.com>
  Date:   2017-10-19 (Thu, 19 Oct 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Add a pure Python 2.7 build to .travis.yml.