Update LICENSE

Author: SudKul

LICENSE

@@ -1,10 +1,10 @@
-Copyright © 2012 - 2020, Udacity, Inc.
+Copyright © 2012 - 2021, Udacity, Inc.
 
 Udacity hereby grants you a license in and to the Educational Content, including
 but not limited to homework assignments, programming assignments, code samples,
 and other educational materials and tools (as further described in the Udacity
 Terms of Use), subject to, as modified herein, the terms and conditions of the
-Creative Commons Attribution-NonCommercial- NoDerivs 3.0 License located at
+Creative Commons Attribution-NonCommercial- NoDerivs 4.0 License located at
 http://creativecommons.org/licenses/by-nc-nd/4.0 and successor locations for
 such license (the "CC License") provided that, in each case, the Educational
 Content is specifically marked as being subject to the CC License.