updated for version 7.4.284

Problem:    Setting 'langmap' in the modeline can cause trouble.  E.g. mapping
            ":" breaks many commands. (Jens-Wolfhard Schicke-Uffmann)
Solution:   Disallow setting 'langmap' from the modeline.

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    284,
 /**/
     283,
 /**/