fix run once issue (#173)

Author: TimothyYe

pkg/notification/manager.go

@@ -4,7 +4,6 @@ import (
 	"sync"
 
 	"github.com/TimothyYe/godns/internal/settings"
-	"github.com/TimothyYe/godns/pkg/lib"
 
 	log "github.com/sirupsen/logrus"
 )
@@ -72,10 +71,8 @@ func initNotifications(conf *settings.Settings) map[string]INotification {
 
 func (n *notificationManager) Send(domain, currentIP string) {
 	for _, sender := range n.notifications {
-		lib.SafeGo(func() {
-			if err := sender.Send(domain, currentIP); err != nil {
-				log.Error("Send notification with error:", err)
-			}
-		})
+		if err := sender.Send(domain, currentIP); err != nil {
+			log.Error("Send notification with error:", err)
+		}
 	}
 }