updated for version 7.4.689

Problem:    On MS-Windows, when 'autochdir' is set, diff mode with files in
            different directories does not work. (Axel Bender)
Solution:   Remember the current directory and use it where needed. (Christian
            Brabandt)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    689,
 /**/
     688,
 /**/