[Checkins] [zopefoundation/zope.interface] 30815e: MacOS wheels for 3.8

[Michael Howitz]

  Branch: refs/heads/4.7
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: 30815e97af70465c02a72fb2a932cccde66f770e
      https://github.com/zopefoundation/zope.interface/commit/30815e97af70465c02a72fb2a932cccde66f770e
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-13 (Fri, 13 Mar 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  MacOS wheels for 3.8

Copy-pasted from `persistent` as suggested by @mgedmin