patch 8.1.1389: changes are not flushed when end and start overlap

Problem:    Changes are not flushed when end and start overlap. (Paul Jolly)
Solution:   When end of a previous changes overlaps with start of a new
            change, first flush listeners.
diff --git a/src/version.c b/src/version.c
index 81b7486..03ad4bc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1389,
+/**/
     1388,
 /**/
     1387,