[Checkins] [zopefoundation/zope.deferredimport] 9663df: fix race condition

[Dieter Maurer]

  Branch: refs/heads/race_condition#8
  Home:   https://github.com/zopefoundation/zope.deferredimport
  Commit: 9663dfc1f8e5ecfe8767bff2df8b29024b6f660d
      https://github.com/zopefoundation/zope.deferredimport/commit/9663dfc1f8e5ecfe8767bff2df8b29024b6f660d
  Author: dieter <dieter at handshake.de>
  Date:   2019-07-23 (Tue, 23 Jul 2019)

  Changed paths:
    M CHANGES.rst
    M src/zope/deferredimport/deferredmodule.py

  Log Message:
  -----------
  fix race condition