version bump to 2.28.3

NEWS

+Version 2.28.3
+--------------
+	* build fixes for ever-shifting vala
+        * Updated translations:
+	- Japanese (ja)
+
 Version 2.28.2
 --------------
 	* Config.vapi was missing from the tar files

configure.ac

-AC_INIT([moserial],[2.28.2],[http://bugzilla.gnome.org/enter_bug.cgi?product=moserial])
+AC_INIT([moserial],[2.28.3],[http://bugzilla.gnome.org/enter_bug.cgi?product=moserial])
 AC_CONFIG_SRCDIR([Makefile.am])
 AC_CONFIG_HEADERS(config.h)
 AM_INIT_AUTOMAKE([dist-bzip2])