[Checkins] [zopefoundation/BTrees] 3f91e6: Fix AppVeyor link

[GitHub]

  Branch: refs/heads/badges
  Home:   https://github.com/zopefoundation/BTrees
  Commit: 3f91e6509cb763390711572cb17aebd039fc1d0c
      https://github.com/zopefoundation/BTrees/commit/3f91e6509cb763390711572cb17aebd039fc1d0c
  Author: Marius Gedminas <marius at gedmin.as>
  Date:   2016-04-13 (Wed, 13 Apr 2016)

  Changed paths:
    M README.rst

  Log Message:
  -----------
  Fix AppVeyor link