[Checkins] [zopefoundation/zope.i18nmessageid] a4211a: Use MacPython 3.6.2

[Jason Madden]

  Branch: refs/heads/use-3.6.2
  Home:   https://github.com/zopefoundation/zope.i18nmessageid
  Commit: a4211a9c000ff0e86c2570298c98197223fc3864
      https://github.com/zopefoundation/zope.i18nmessageid/commit/a4211a9c000ff0e86c2570298c98197223fc3864
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2020-01-20 (Mon, 20 Jan 2020)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Use MacPython 3.6.2

Also add 3.8.0