Flutter warnings fixed (part 3) (#208)

* Flutter warnings fixed (#204)

Co-authored-by: GitHub Action <[email protected]>

* Flutter warnings fixed (part 2) (#205)

* Flutter warnings fixed (#203)

Co-authored-by: GitHub Action <[email protected]>

* Flutter warnings fixed (part 2)

---------

Co-authored-by: GitHub Action <[email protected]>

* Flutter warnings fixed (part 3)

---------

Co-authored-by: GitHub Action <[email protected]>

Author: SpertsyanKM

lib/src/dto/sk_product/discount.dart

@@ -1,5 +1,3 @@
-import 'dart:ui';
-
 import 'package:json_annotation/json_annotation.dart';
 import 'package:qonversion_flutter/src/internal/mapper.dart';
 
@@ -72,6 +70,6 @@ class SKProductDiscountWrapper {
   }
 
   @override
-  int get hashCode => hashValues(this.price, this.priceLocale,
+  int get hashCode => Object.hash(this.price, this.priceLocale,
       this.numberOfPeriods, this.paymentMode, this.subscriptionPeriod);
 }

lib/src/dto/sk_product/sk_product_wrapper.dart

@@ -1,7 +1,5 @@
 // Copyright 2019 The Chromium Authors. All rights reserved.
 
-import 'dart:ui' show hashValues;
-
 import 'package:json_annotation/json_annotation.dart';
 import 'package:qonversion_flutter/src/internal/mapper.dart';
 
@@ -92,7 +90,7 @@ class SKProductWrapper {
   }
 
   @override
-  int get hashCode => hashValues(
+  int get hashCode => Object.hash(
       this.productIdentifier,
       this.localizedTitle,
       this.localizedDescription,
@@ -139,5 +137,5 @@ class SKPriceLocaleWrapper {
   }
 
   @override
-  int get hashCode => hashValues(this.currencySymbol, this.currencyCode);
+  int get hashCode => Object.hash(this.currencySymbol, this.currencyCode);
 }

lib/src/dto/sk_product/subscription_period.dart

@@ -1,5 +1,3 @@
-import 'dart:ui';
-
 import 'package:json_annotation/json_annotation.dart';
 
 import 'subscription_period_unit.dart';
@@ -53,5 +51,5 @@ class SKProductSubscriptionPeriodWrapper {
   }
 
   @override
-  int get hashCode => hashValues(this.numberOfUnits, this.unit);
+  int get hashCode => Object.hash(this.numberOfUnits, this.unit);
 }