patch 9.0.1159: extends argument for class not implemented yet

Problem:    Extends argument for class not implemented yet.
Solution:   Basic implementation of "extends".
diff --git a/src/version.c b/src/version.c
index 560fb9d..a9a5404 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1159,
+/**/
     1158,
 /**/
     1157,