[Checkins] [zopefoundation/zope.container] b4de72: Fix twine installation on Mac OS

[Marius Gedminas]

  Branch: refs/heads/more-wheels
  Home:   https://github.com/zopefoundation/zope.container
  Commit: b4de72eace872dc4d82250ba066d52870c155f53
      https://github.com/zopefoundation/zope.container/commit/b4de72eace872dc4d82250ba066d52870c155f53
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-11-11 (Mon, 11 Nov 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Fix twine installation on Mac OS