Adds release notes or 2.4.1

Author: rijnb

README.md

@@ -383,6 +383,11 @@ Please check http://www.mapcode.com to see if there is a more up-to-date version
 
 # Version History
 
+### 2.4.1
+
+* Fixed bug in `getTerritoryAlphaCode` when getting the shortest unambiguous code for `US-CA`,
+which is `CA`, not `US-CA`. 
+
 ### 2.4.0
 
 * Added scripts for Korean (Choson'gul / Hangul), Burmese, Khmer, Sinhalese, Thaana (Maldivan),