updated for version 7.3.589

Problem:    Crash when $HOME is not set.
Solution:   Check for a NULL pointer. (Chris Webb)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    589,
 /**/
     588,
 /**/