updated for version 7.2.428

Problem:    Using setqflist([]) to clear the error list doesn't work properly.
Solution:   Set qf_nonevalid to TRUE when appropriate. (Christian Brabandt)

src/version.c

@@ -681,6 +681,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    428,
 /**/
     427,
 /**/