[Checkins] [zopefoundation/ZODB] b5ba02: Try to install a python-version-appropriate Sphinx...

[Jason Madden]

  Branch: refs/heads/issue263
  Home:   https://github.com/zopefoundation/ZODB
  Commit: b5ba0250b1004b9691d2090f6a1a53d515c9eecf
      https://github.com/zopefoundation/ZODB/commit/b5ba0250b1004b9691d2090f6a1a53d515c9eecf
  Author: Jason Madden <jamadden at gmail.com>
  Date:   2019-05-07 (Tue, 07 May 2019)

  Changed paths:
    M .travis.yml
    M buildout.cfg

  Log Message:
  -----------
  Try to install a python-version-appropriate Sphinx version.

Also upbate the .travis.yml to pick up modern versions of PyPy and PyPy3