[Checkins] [zopefoundation/zope.dublincore] 640b15: Update .travis.yml

[Michael Howitz]

  Branch: refs/heads/support-py3+
  Home:   https://github.com/zopefoundation/zope.dublincore
  Commit: 640b152ac584217896effdec84bf61888138d8f4
      https://github.com/zopefoundation/zope.dublincore/commit/640b152ac584217896effdec84bf61888138d8f4
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-10-13 (Tue, 13 Oct 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Update .travis.yml

Co-authored-by: Marius Gedminas <marius at gedmin.as>