[Checkins] [zopefoundation/z3c.relationfield] 3be13a: Add test to demonstrate modify issue

[GitHub]

  Branch: refs/heads/tg_smarter_update2
  Home:   https://github.com/zopefoundation/z3c.relationfield
  Commit: 3be13ac5ccffc5617f779b8de9b57c213b518036
      https://github.com/zopefoundation/z3c.relationfield/commit/3be13ac5ccffc5617f779b8de9b57c213b518036
  Author: Tom Gross <itconsense at gmail.com>
  Date:   2018-04-18 (Wed, 18 Apr 2018)

  Changed paths:
    M src/z3c/relationfield/README.rst

  Log Message:
  -----------
  Add test to demonstrate modify issue