Changed links in webgl_animation_keyframes example.

Author: mrdoob

examples/webgl_animation_keyframes.html

@@ -37,8 +37,8 @@
 		<div id="info">
 			<a href="http://threejs.org" target="_blank" rel="noopener">three.js</a> webgl - animation - keyframes
 			<p>
-				Model: <a href="https://sketchfab.com/models/94b24a60dc1b48248de50bf087c0f042" target="_blank" rel="noopener">Littlest Tokyo</a> by
-				<a href="https://sketchfab.com/glenatron" target="_blank" rel="noopener">glenatron</a>, CC Attribution.
+				Model: <a href="https://www.artstation.com/artwork/1AGwX" target="_blank" rel="noopener">Littlest Tokyo</a> by
+				<a href="https://www.artstation.com/glenatron" target="_blank" rel="noopener">glenatron</a>, CC Attribution.
 			</p>
 		</div>