Update library version number to 2.1.16
diff --git a/ChangeLog b/ChangeLog
index b346325..3500ffe 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 2.1.16 branch released 2018-11-19
 
 Security
    * Fix overly strict DN comparison when looking for CRLs belonging to a