patch 8.0.0306: mode() not sufficiently tested

Problem:    mode() not sufficiently tested.
Solution:   Add more tests. (Yegappan Lakshmanan)
diff --git a/src/version.c b/src/version.c
index 78cb27f..e0fa3cb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    306,
+/**/
     305,
 /**/
     304,