updated for version 7.3.456
Problem:    ":tab drop file" has several problems, including moving the
            current window and opening a new tab for a file that already has a
            window.
Solution:   Refactor ":tab drop" handling. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 7945ffe..f47e7bd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -715,6 +715,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    456,
+/**/
     455,
 /**/
     454,