Update README.md to fix typo

README.md

@@ -1,6 +1,6 @@
 # MAST-U IMAS Mappings
 
-### Licences
+### Licenses
 This repository contains code and data that are subject to different licenses. 
 * The code is licensed under the Apache License 2.0, which allows for extensive freedom in using, modifying, and distributing the software, provided that the license terms are met.
 * The mappings, however, are licensed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License, which permits use, distribution, and adaptation, as long as appropriate credit is given to the original source.