updated for version 7.3.889

Problem:    Can't build with Ruby 2.0 on a 64 bit system.
Solution:   Define rb_fix2int and rb_num2int. (Kohei Suzuki)

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    889,
 /**/
     888,
 /**/