[Checkins] [zopefoundation/zope.event] 65600d: Add RTD badge.

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/zope.event
  Commit: 65600de49724845398d80bfc3d892a98fd3dde68
      https://github.com/zopefoundation/zope.event/commit/65600de49724845398d80bfc3d892a98fd3dde68
  Author: Tres Seaver <tseaver at palladion.com>
  Date:   2015-01-28 (Wed, 28 Jan 2015)

  Changed paths:
    M README.rst

  Log Message:
  -----------
  Add RTD badge.