patch 7.4.1570

Problem:    There is no way to avoid the message when editing a file.
Solution:   Add the "F" flag to 'shortmess'. (Shougo, closes #686)

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1570,
 /**/
     1569,
 /**/