add CVE

Author: remicollet

NEWS

@@ -13,7 +13,7 @@ PHP                                                                        NEWS
   . Fixed bug #67827 (broken detection of system crypt sha256/sha512 support).
     (ncopa at alpinelinux dot org)  
   . Fixed bug #68942 (Use after free vulnerability in unserialize() with
-    DateTimeZone). (Stas)
+    DateTimeZone). (CVE-2015-0273) (Stas)
 
 - Enchant: 
   . Fixed bug #6855 (heap buffer overflow in enchant_broker_request_dict()).