updated changes.txt for 4.0.4

Author: tanmaykm

CHANGES.txt

@@ -1,3 +1,4 @@
+v4.0.4,      12 Apr 2014 -- Fixed bugs in handling include/exclude pairs.
 v4.0.3,      06 Apr 2014 -- Fixed batch mode for GUI 
 v4.0.1,      28 Mar 2014 -- Stable version with bug fixes and user interface tweaks.
 v4.0.0-beta, 25 Nov 2013 -- Beta release