[Checkins] [zopefoundation/z3c.form] fd3ad3: fix Python 3 test failures (part 1)

[GitHub]

  Branch: refs/heads/tomgross-odict_manager_master
  Home:   https://github.com/zopefoundation/z3c.form
  Commit: fd3ad383b0dfc127f53430379e9cf5a1eab19ff2
      https://github.com/zopefoundation/z3c.form/commit/fd3ad383b0dfc127f53430379e9cf5a1eab19ff2
  Author: Tom Gross <itconsense at gmail.com>
  Date:   2018-05-15 (Tue, 15 May 2018)

  Changed paths:
    M src/z3c/form/button.rst
    M src/z3c/form/contentprovider.py
    M src/z3c/form/util.rst

  Log Message:
  -----------
  fix Python 3 test failures (part 1)



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