Demo Missing css-beziers.js

[jmbeck]

Maybe this is by design, but the demo scrolling gets sticky because it doesn't come stock with css-beziers. Since I, like most people, skip over the readme, it took me a long time to figure this out.

Would you be willing to add this?
<script src="https://github.com/davidaurelio/css-beziers/raw/master/src/css-beziers.js"></script>

That way you still don't have to include it in your project, but developers looking through your demo/index.html will know they need it.