use stderr instead of stdout for ui error writer

Author: 4kord

sql-migrate/main.go

@@ -14,7 +14,7 @@ func main() {
 var ui cli.Ui
 
 func realMain() int {
-	ui = &cli.BasicUi{Writer: os.Stdout}
+	ui = &cli.BasicUi{Writer: os.Stdout, ErrorWriter: os.Stderr}
 
 	cli := &cli.CLI{
 		Args: os.Args[1:],