clean up

lib/domain/vo/shipment_status.dart

@@ -0,0 +1,17 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+class ShipmentStatus {
+  String status;
+  DateTime date;
+  bool done;
+  ShipmentStatus({this.status, this.date, this.done});
+
+  factory ShipmentStatus.fromMap(Map<String, dynamic> map) {
+    var _date = (map['date'] as Timestamp);
+    return ShipmentStatus(
+      status: map['status'],
+      date: _date == null ? null : _date.toDate(),
+      done: map['done'],
+    );
+  }
+}