patch 7.4.2077

Problem:    Cannot update 'tabline' when a tab was closed.
Solution:   Add the TabClosed autocmd event. (partly by Felipe Morales)

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2077,
 /**/
     2076,
 /**/