Fixed udacity link.

index.html

@@ -242,7 +242,7 @@
 				<div id="resource">
 				<script>
 					var resources = [
-						'<a href="http://www.udacity.com/overview/Course/cs291/" target="_blank"><img src="files/udacity.png" width="121" height="152" /></a>',
+						'<a href="https://www.udacity.com/course/interactive-3d-graphics--cs291" target="_blank"><img src="files/udacity.png" width="121" height="152" /></a>',
 						'<a href="http://davidscottlyons.com/threejs/presentations/frontporch14/" target="_blank"><img src="files/intro.png" width="121" height="106" /></a>'
 					];
 					document.write( resources[ Math.floor( Math.random() * resources.length ) ] );