fix(local-notifications): delete delivered notifications on iOS (#603)

Author: jkatins

packages/local-notifications/index.ios.ts

@@ -370,6 +370,7 @@ export class LocalNotificationsImpl extends LocalNotificationsCommon implements
 			try {
 				if (LocalNotificationsImpl.isUNUserNotificationCenterAvailable()) {
 					UNUserNotificationCenter.currentNotificationCenter().removePendingNotificationRequestsWithIdentifiers(<any>['' + id]);
+					UNUserNotificationCenter.currentNotificationCenter().removeDeliveredNotificationsWithIdentifiers(<any>['' + id]);
 					resolve(true);
 				} else {
 					const scheduled = UIApplication.sharedApplication.scheduledLocalNotifications;
@@ -395,6 +396,7 @@ export class LocalNotificationsImpl extends LocalNotificationsCommon implements
 			try {
 				if (LocalNotificationsImpl.isUNUserNotificationCenterAvailable()) {
 					UNUserNotificationCenter.currentNotificationCenter().removeAllPendingNotificationRequests();
+					UNUserNotificationCenter.currentNotificationCenter().removeAllDeliveredNotifications();
 				} else {
 					UIApplication.sharedApplication.cancelAllLocalNotifications();
 				}