[Checkins] [zopefoundation/Products.PythonScripts] f11bd8: try to fix travis tests.

[GitHub]

  Branch: refs/heads/Python3_port
  Home:   https://github.com/zopefoundation/Products.PythonScripts
  Commit: f11bd89ab72386e4c3f69c7d1f015380b673de5d
      https://github.com/zopefoundation/Products.PythonScripts/commit/f11bd89ab72386e4c3f69c7d1f015380b673de5d
  Author: stephan-hof <sh at axiros.com>
  Date:   2017-06-08 (Thu, 08 Jun 2017)

  Changed paths:
    M .travis.yml
    M buildout.cfg

  Log Message:
  -----------
  try to fix travis tests.

* Rely on the versions used by Zope2.
* Use more python versions inside travis.