updated for version 7.3.588

Problem:    Crash on NULL pointer.
Solution:   Fix the immediate problem by checking for NULL. (Lech Lorens)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    588,
 /**/
     587,
 /**/