Correct the markdown in the README.md example

### Before
![screen shot 2013-12-04 at 11 29 18 am](https://f.cloud.github.com/assets/54056/1674956/5b86c826-5d01-11e3-9ed7-5eadb89cea4a.png)

### After
![screen shot 2013-12-04 at 11 29 26 am](https://f.cloud.github.com/assets/54056/1674957/5b89f622-5d01-11e3-9c89-3335165ecd30.png)