Add author handle to notification log message

tasks/checkNotifications.ts

···
       let notificationCounter = 1;
       for (const notification of unreadNotifications) {
         console.log(
-          `processing notification #${notificationCounter} [${notification.reason}]`,
+          `processing notification #${notificationCounter} [${notification.reason} from @${notification.author.handle}]`,
         );
         await processNotification(notification);
         notificationCounter++;