updated for version 7.3.528

Problem:    Crash when closing last window in a tab. (Alex Efros)
Solution:   Use common code in close_last_window_tabpage(). (Christian
            Brabandt)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    528,
 /**/
     527,
 /**/