Updated ChangeLog for PR#565

Updated ChangeLog for pull request #565 - Remove unused consts from oid lists

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 8adcc1e..99c88e8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -24,6 +24,8 @@
    * Added support for 3 and 4 byte lengths to mbedtls_asn1_write_len().
    * Added support for a Yotta specific configuration file -
      through the symbol YOTTA_CFG_MBEDTLS_TARGET_CONFIG_FILE.
+   * Added optimization for code space for X.509/OID based on configured
+     features. (contributed by Aviv Palivoda)
 
 = mbed TLS 2.3.0 branch released 2016-06-28