Rename duck.gltf with Duck.gltf in gltf2 example

examples/webgl_loader_gltf2.html

@@ -432,7 +432,7 @@
 					addEnvMap: true
 				},
 				{
-					name : 'Duck', url : './models/gltf/Duck/%s/duck.gltf',
+					name : 'Duck', url : './models/gltf/Duck/%s/Duck.gltf',
 					cameraPos: new THREE.Vector3(0, 3, 5),
 					addLights:true,
 					addGround:true,