updated for version 7.3.593

Problem:    No easy way to decide if b:browsefilter will work.
Solution:   Add the browsefilter feature.

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    593,
 /**/
     592,
 /**/