patch 8.0.0589: :simalt still does not work

Problem:    :simalt still does not work.
Solution:   Use K_NOP instead of K_IGNORE. (Christian Brabandt)
diff --git a/src/version.c b/src/version.c
index 3b84b05..200ace0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    589,
+/**/
     588,
 /**/
     587,