Update version to 2.12.0
diff --git a/ChangeLog b/ChangeLog
index c997b2c..4455825 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 2.12.0 branch released 2018-07-25
 
 Security
    * Fix a vulnerability in TLS ciphersuites based on CBC and using SHA-384,