patch 8.1.1445: popup window border highlight not implemented yet

Problem:    Popup window border highlight not implemented yet.
Solution:   Implement the "borderhighlight" option.
diff --git a/src/version.c b/src/version.c
index a82e6e9..3be4e65 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1445,
+/**/
     1444,
 /**/
     1443,