[Checkins] [zopefoundation/z3c.checkversions] b583be: Fix compatibility with setuptools 39.

[GitHub]

  Branch: refs/heads/fix-8
  Home:   https://github.com/zopefoundation/z3c.checkversions
  Commit: b583be2e5333028206c7e8b2509b301a61954e35
      https://github.com/zopefoundation/z3c.checkversions/commit/b583be2e5333028206c7e8b2509b301a61954e35
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-04-23 (Mon, 23 Apr 2018)

  Changed paths:
    M CHANGES.rst
    M setup.py
    M src/z3c/checkversions/base.py

  Log Message:
  -----------
  Fix compatibility with setuptools 39.

Fixes #8.