Merge pull request github#314 from github/html-pipeline

link to html-pipeline in the docs

Author: gjtorikian

README.md

@@ -2,7 +2,7 @@ GitHub Markup
 =============
 
 We use this library on GitHub when rendering your README or any other
-rich text file.
+rich text file. The generated HTML is then run through filters in the [html-pipeline](https://github.com/jch/html-pipeline) to perform things like [santization](#html-sanitization) and [syntax highlighting](https://github.com/jch/html-pipeline/blob/master/lib/html/pipeline/syntax_highlight_filter.rb).
 
 Markups
 -------