[Checkins] [zopefoundation/Products.MailHost] 321951: - prevent setuptools version conflicts in travis

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Products.MailHost
  Commit: 32195121f049fa2e37a97367f6be22eadde6b3f7
      https://github.com/zopefoundation/Products.MailHost/commit/32195121f049fa2e37a97367f6be22eadde6b3f7
  Author: Jens Vagelpohl <jens at netz.ooo>
  Date:   2017-05-23 (Tue, 23 May 2017)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  - prevent setuptools version conflicts in travis