patch 8.0.0289: no test for "ga" and :ascii

Problem:    No test for "ga" and :ascii.
Solution:   Add a test. (Dominique Pelle, closes #1429)
diff --git a/src/version.c b/src/version.c
index 4e041c6..b49b995 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    289,
+/**/
     288,
 /**/
     287,