GLTFExporter credits where it's due

examples/js/exporters/GLTFExporter.js

@@ -1,5 +1,7 @@
 /**
  * @author fernandojsg / http://fernandojsg.com
+ * @author Don McCurdy / https://www.donmccurdy.com
+ * @author Takahiro / https://github.com/takahirox
  */
 
 //------------------------------------------------------------------------------