fix go vet fails for go1.4

Author: kpacha

main.go

@@ -25,7 +25,11 @@ func main() {
 	configPath := flag.String("c", ConfigPath, "path to the config file")
 	flag.Parse()
 
-	cp := config.ConfigParser{*configPath, true}
+	cp := config.ConfigParser{
+		Path:     *configPath,
+		AllowDNS: true,
+	}
+
 	conf, err := cp.Parse()
 	if err != nil {
 		log.Println("Error parsing config file:", err.Error())