Merged optimizations for MODP NIST curves

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 3f07469..f25cd60 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,7 @@
 = PolarSSL 1.3 branch
 Features
    * PK tests added to test framework
+   * Added optional optimization for NIST MODP curves (POLARSSL_ECP_NIST_OPTIM)
 
 Bugfix
    * Server does not send out extensions not advertised by client