Examples: Added tone mapping to webgl_loader_gltf_extensions.

examples/webgl_loader_gltf_extensions.html

@@ -149,6 +149,8 @@
 				renderer.setPixelRatio( window.devicePixelRatio );
 				renderer.setSize( window.innerWidth, window.innerHeight );
 				renderer.outputEncoding = THREE.sRGBEncoding;
+				renderer.toneMapping = THREE.ACESFilmicToneMapping;
+				renderer.toneMappingExposure = 1.25;
 				renderer.physicallyCorrectLights = true;
 				document.body.appendChild( renderer.domElement );