update changelog

git-svn-id: svn+ssh://svn.savannah.nongnu.org/linphone/trunk@773 3f6dc0c8-ddfe-455d-9043-3cd528dc4637

linphone/mediastreamer2/NEWS

+mediastreamer-2.3.2: ????????
+	* use libv4l2 when possible to benefit from hardware pixel conversion
+	* added jpeg over RTP support
+
 mediastreamer-2.3.1: October 5, 2009
 	* preserve ratio in windows video display (not yet implemented for linux/SDL)