fix dead link

examples/webgl_postprocessing_advanced.html

@@ -35,7 +35,7 @@
 
 		<div id="info">
 			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> - webgl postprocessing example -
-			<a href="http://graphics.cs.williams.edu/data/meshes.xml#14" target="_blank" rel="noopener">Lee Perry-Smith</a> head
+			<a href="http://g3d.cs.williams.edu/g3d/data10/index.html#mesh19" target="_blank" rel="noopener">Lee Perry-Smith</a> head
 		</div>
 
 		<div id="container"></div>