README: Make coverwalls happy with the badge included in the README.

Otherwise, I get a huge banner telling me that I should include this.
jplehmann · Dec 10, 2013 · 1edfd9d · 1edfd9d
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 # Coursera Downloader
 
 [![Build Status](https://travis-ci.org/coursera-dl/coursera.png?branch=master)](https://travis-ci.org/coursera-dl/coursera)
+[![Coverage Status](https://coveralls.io/repos/coursera-dl/coursera/badge.png)](https://coveralls.io/r/coursera-dl/coursera)
 
 [Coursera][1] is arguably the leader in *massive open online courses* (MOOC)
 with a selection of more than 300 classes from 62 different institutions [as of