[Checkins] [zopefoundation/Persistence] 2331e3: Update buildout/tox. (#7)

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/Persistence
  Commit: 2331e357e85ad6d2a56daccb2b4c3be3a8bed7f4
      https://github.com/zopefoundation/Persistence/commit/2331e357e85ad6d2a56daccb2b4c3be3a8bed7f4
  Author: Hanno Schlichting <hanno at hannosch.eu>
  Date:   2017-05-28 (Sun, 28 May 2017)

  Changed paths:
    M .travis.yml
    M buildout.cfg
    M setup.cfg
    M tox.ini

  Log Message:
  -----------
  Update buildout/tox. (#7)