add mix carton

lib/domain/entities/package.dart

@@ -123,6 +123,12 @@ class Package {
         currentStatusDate: DateTime.parse(json['status_date']));
   }
 
+  @override
+  bool operator ==(Object other) => other is Package && other.id == id;
+
+  @override
+  int get hashCode => id.hashCode;
+
   @override
   String toString() {
     return 'Package{id: $id, status: $status, market:$market, trackingID: $trackingID,}';