updated for version 7.3.789

Problem:    "\k" in regexp does not work in other window.
Solution:   Use the right buffer. (Yukihiro Nakadaira)

src/version.c

@@ -725,6 +725,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    789,
 /**/
     788,
 /**/