Update LICENSE

@2013 AT&T Intellectual Property. All rights reserved. http://developer.att.com The Application hosted on this site are working examples intended to be used for reference in creating products to consume AT&T Services and not meant to be used as part of your product. The data in these pages is for test purposes only and intended only for use as a reference in how the services perform. For download of tools and documentation, please go to https://devconnect-api.att.com For more information contact developer.support@att.com