updated for version 7.3.504

Problem:    Commands in help files are not highlighted.
Solution:   Allow for commands in backticks.  Adjust CTRL-] to remove the
            backticks.

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    504,
 /**/
     503,
 /**/