Finalise ChangeLog

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/ChangeLog b/ChangeLog
index dc2ffb2..05e4237 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 Mbed TLS ChangeLog (Sorted per branch, date)
 
-= Mbed TLS x.x.x branch released xxxx-xx-xx
+= Mbed TLS 3.6.1 branch released 2024-08-30
 
 API changes
    * The experimental functions psa_generate_key_ext() and