Update CMAC test vectors.

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index e7abf55..f77cbba 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -12,6 +12,13 @@
      the input string in PEM format to extract the different components. Found
      by Eyal Itkin.
 
+= mbed TLS 2.4.x branch released 2016-xx-xx
+
+Changes
+   * Update to CMAC test data, taken from - NIST Special Publication 800-38B -
+     Recommendation for Block Cipher Modes of Operation: The CMAC Mode for
+     Authentication – October  2016
+
 = mbed TLS 2.4.0 branch released 2016-10-17
 
 Security