Add ChangeLog entry for config-no-entropy.h change
diff --git a/ChangeLog b/ChangeLog
index da9ee0b..c349a66 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -22,6 +22,8 @@
* Removed mutexes from ECP hardware accelerator code. Now all hardware
accelerator code in the library leaves concurrency handling to the
platform. Reported by Steven Cooreman. #863
+ * Define the macro MBEDTLS_AES_ROM_TABLES in the configuration file
+ config-no-entropy.h to reduce the RAM footprint.
= mbed TLS 2.5.1 released 2017-06-21