Update Subscription.cs

Author: abuzuhri

Source/FikaAmazonAPI/AmazonSpApiSDK/Models/Notifications/Subscription.cs

@@ -28,7 +28,7 @@ public partial class Subscription : IEquatable<Subscription>, IValidatableObject
         /// Initializes a new instance of the <see cref="Subscription" /> class.
         /// </summary>
         [JsonConstructorAttribute]
-        protected Subscription() { }
+        public Subscription() { }
         /// <summary>
         /// Initializes a new instance of the <see cref="Subscription" /> class.
         /// </summary>