updated for version 7.4.589

Problem:    In the MS-Windows console Vim can't handle greek characters when
            encoding is utf-8.
Solution:   Escape K_NUL. (Yasuhiro Matsumoto)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    589,
 /**/
     588,
 /**/