So, this file is read in by the gemspec and displayed post-install. That's why I didn't use the markdown or the fences.  

Also, I think I was just following a pattern already in the gemspec.

In any case, if this file is renamed, we'll need to change the code in https://github.com/mbleigh/acts-as-taggable-on/blob/master/acts-as-taggable-on.gemspec#L21