[Checkins] [zopefoundation/zodbpickle] d7e8c3: Add coverage badge.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zodbpickle
  Commit: d7e8c3750a2a9e3650e7efcec2b4b9962d7b7246
      https://github.com/zopefoundation/zodbpickle/commit/d7e8c3750a2a9e3650e7efcec2b4b9962d7b7246
  Author: Michael Howitz <mh at gocept.com>
  Date:   2018-02-19 (Mon, 19 Feb 2018)

  Changed paths:
    M README.rst

  Log Message:
  -----------
  Add coverage badge.

[skip ci]