Update version to 2.7.2
diff --git a/ChangeLog b/ChangeLog
index f132721..a25a799 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 2.7.2 branch released 2018-03-16
 
 Security
    * Verify results of RSA private key operations to defend