patch 8.1.0876: completion match not displayed when popup menu is not shown

Problem:    Completion match not displayed when popup menu is not shown.
Solution:   Call update_screen() when not displaying the popup menu to show
            the inserted match. (Ken Takata, Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 9b2e7c9..dbf0cab 100644
--- a/src/version.c
+++ b/src/version.c
@@ -784,6 +784,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    876,
+/**/
     875,
 /**/
     874,