Show usage with syntax highlighting

I recently published a syntax highlighting module (does the repetitive try/catch highlight.js loop for you) that also includes syntax highlighting inside diffs (like Github recently supported). Aside from being simple to use and include, I think the readme can benefit showing how to add syntax highlighting to markdown files, regardless of whether it's this module or the raw highlight.js function.

Module in action with diffs: http://blakeembrey.com/articles/2014/09/building-a-blog-with-metalsmith/