[Checkins] [zopefoundation/zope.interface] 5f63c1: Upgrade pip

[Marius Gedminas]

  Branch: refs/heads/fix-macos-maybe
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: 5f63c11549e4ec74c0a222ddf02d7ff0abefbb1b
      https://github.com/zopefoundation/zope.interface/commit/5f63c11549e4ec74c0a222ddf02d7ff0abefbb1b
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-11-11 (Mon, 11 Nov 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Upgrade pip