[Checkins] [zopefoundation/zope.interface] b10f42: Build docs with Sphinx on Travis CI

[Marius Gedminas]

  Branch: refs/heads/docs-in-py3
  Home:   https://github.com/zopefoundation/zope.interface
  Commit: b10f42191f52ff067ff75e35e8c7ba65347f39cd
      https://github.com/zopefoundation/zope.interface/commit/b10f42191f52ff067ff75e35e8c7ba65347f39cd
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2019-08-18 (Sun, 18 Aug 2019)

  Changed paths:
    M .travis.yml

  Log Message:
  -----------
  Build docs with Sphinx on Travis CI

YAML borrowed from zopefoundation/persistent.