[Checkins] [zopefoundation/zope.hookable] 6dd4e4: Add 3.8 wheels for mac os.

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.hookable
  Commit: 6dd4e4be6d91815109bbbc2ed3317d8d97ece97f
      https://github.com/zopefoundation/zope.hookable/commit/6dd4e4be6d91815109bbbc2ed3317d8d97ece97f
  Author: Michael Howitz <mh at gocept.com>
  Date:   2020-03-13 (Fri, 13 Mar 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Add 3.8 wheels for mac os.