patch 8.0.0259: tab commands do not handle count correctly

Problem:    Tab commands do not handle count correctly. (Ken Hamada)
Solution:   Add ADDR_TABS_RELATIVE. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index aaeb258..05d2dd4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    259,
+/**/
     258,
 /**/
     257,