updated for version 7.3.857

Problem:    The QuitPre autocommand event does not trigger for :qa and :wq.
Solution:   Trigger the event. (Tatsuro Fujii)

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    857,
 /**/
     856,
 /**/