patch 7.4.1757

Problem:    When using complete() it may set 'modified' even though nothing
            was inserted.
Solution:   Use Down/Up instead of Next/Previous match. (Shougo, closes #745)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1757,
 /**/
     1756,
 /**/