Update ChangeLog

ChangeLog

@@ -45,6 +45,7 @@ LibreSSL Portable Release Notes:
 	    These make use of the SHA-NI instruction if it is available and
 	    replace the perl-generated assembly optimized for museum pieces.
 	  - Rewrote BN_bn2binpad() and its lebin siblings.
+	  - The BIGNUMs in EC_GROUP and EC_POINT are now heap allocated.
 	* Compatibility changes
 	  - Added an OPENSSL_INIT_NO_ATEXIT flag for OPENSSL_init_crypto().
 	    It has no effect since LibreSSL doesn't call atexit().