[Checkins] [zopefoundation/z3c.relationfield] a13fca: Provide IRelationBrokenEvent to be able to disting...

[Nathan Van Gheem]

  Branch: refs/heads/broken-event
  Home:   https://github.com/zopefoundation/z3c.relationfield
  Commit: a13fcae0376900ac2f2ab0d2219664ea76ca2ba1
      https://github.com/zopefoundation/z3c.relationfield/commit/a13fcae0376900ac2f2ab0d2219664ea76ca2ba1
  Author: vangheem <vangheem at gmail.com>
  Date:   2019-03-20 (Wed, 20 Mar 2019)

  Changed paths:
    M CHANGES.rst
    M src/z3c/relationfield/event.py
    M src/z3c/relationfield/interfaces.py

  Log Message:
  -----------
  Provide IRelationBrokenEvent to be able to distinguish the event when it is broken