revert excuse-our-dust message back to h3, looked better that way

README.md

+
 # [Video.js - HTML5 and Flash Video Player](http://videojs.com)  [![Build Status](https://travis-ci.org/zencoder/video-js.png?branch=master)](https://travis-ci.org/zencoder/video-js)
 
 Visit the main site at [videojs.com](http://videojs.com) for download options and instructions.
 
-## PLEASE EXCUSE OUR DUST
+### PLEASE EXCUSE OUR DUST
 
 We're finishing up a big overhaul of the libary which includes