Add release info to ChangeLog
diff --git a/ChangeLog b/ChangeLog
index bc2a7c8..7a27fde 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,6 @@
 mbed TLS ChangeLog (Sorted per branch, date)
 
-= mbed TLS 2.16.X branch released XXXX-XX-XX
+= mbed TLS 2.16.5 branch released 2020-02-20
 
 Security
    * Fix potential memory overread when performing an ECDSA signature