[Python-checkins] [python/cpython] aa2a62: Add the Codecov badge for master

[GitHub]

  Branch: refs/heads/master
  Home:   https://github.com/python/cpython
  Commit: aa2a621c8bb476444bd3a9f2c003b3620562d88b
      https://github.com/python/cpython/commit/aa2a621c8bb476444bd3a9f2c003b3620562d88b
  Author: Brett Cannon <brettcannon at users.noreply.github.com>
  Date:   2017-02-10 (Fri, 10 Feb 2017)

  Changed paths:
    M .github/CONTRIBUTING.rst

  Log Message:
  -----------
  Add the Codecov badge for master