Update README.md

Removing the <br> tags will fix the 'extra' codeblocks. I noticed this while looking at your prose styles issue you submitted. Changes to come still on that.

![687474703a2f2f632e6772346d2e636f6d2f696d6167652f327732513378334e335434312f696d616765-5](https://f.cloud.github.com/assets/51578/2264578/4e9ce9e2-9e74-11e3-8542-3e419cc4f859.png)