Update library version number to 2.4.1
diff --git a/ChangeLog b/ChangeLog
index 0372c21..0a857ba 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
-= mbed TLS 2.4.x branch released 2016-xx-xx
+= mbed TLS 2.4.1 branch released 2016-12-13
 
 Changes
    * Update to CMAC test data, taken from - NIST Special Publication 800-38B -