[Checkins] [zopefoundation/zope.index] ccc532: try upgrading pip

[GitHub]

  Branch: refs/heads/manylinux27
  Home:   https://github.com/zopefoundation/zope.index
  Commit: ccc532ccefbfd6228ea938ca773c6797e49e4514
      https://github.com/zopefoundation/zope.index/commit/ccc532ccefbfd6228ea938ca773c6797e49e4514
  Author: Forest Gregg <fgregg at uchicago.edu>
  Date:   2017-04-23 (Sun, 23 Apr 2017)

  Changed paths:
    M appveyor.yml

  Log Message:
  -----------
  try upgrading pip