[Checkins] [zopefoundation/Zope] 8a45ea: Travis: pip install zc.buildout==2.3.1.

[GitHub]

  Branch: refs/heads/altdatabasemanager-roles-213
  Home:   https://github.com/zopefoundation/Zope
  Commit: 8a45eae2a954aaaefab04174b15ee44800482927
      https://github.com/zopefoundation/Zope/commit/8a45eae2a954aaaefab04174b15ee44800482927
  Author: Maurits van Rees <maurits at vanrees.org>
  Date:   2017-05-10 (Wed, 10 May 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Travis: pip install zc.buildout==2.3.1.

'bin/buildout -n' did not help.