Updated README example.

README.md

@@ -104,7 +104,7 @@ This code creates a camera, then creates a scene, adds a cube on it, creates a &
 
 			scene = new THREE.Scene();
 
-			geometry = new Cube( 200, 200, 200 );
+			geometry = new THREE.Cube( 200, 200, 200 );
 			material = new THREE.MeshBasicMaterial( { color: 0xff0000, wireframe: true } );
 
 			mesh = new THREE.Mesh( geometry, material );