[Checkins] [zopefoundation/RestrictedPython] 3878d8: Fix Python 2.7 on appveyor by enforcing a compatib...

[Michael Howitz]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/RestrictedPython
  Commit: 3878d83daba4eba65503fd88bde9fb2f239a59f0
      https://github.com/zopefoundation/RestrictedPython/commit/3878d83daba4eba65503fd88bde9fb2f239a59f0
  Author: Michael Howitz <mh at gocept.com>
  Date:   2019-08-06 (Tue, 06 Aug 2019)

  Changed paths:
    M constraints.txt

  Log Message:
  -----------
  Fix Python 2.7 on appveyor by enforcing a compatible version. (#169)