implement ICommand<> interface

src/Services/Ordering/Ordering.API/Application/Commands/CreateOrderCommand.cs

@@ -18,7 +18,7 @@ namespace Microsoft.eShopOnContainers.Services.Ordering.API.Application.Commands
     // https://msdn.microsoft.com/en-us/library/bb383979.aspx
 
     [DataContract]
-    public class CreateOrderCommand : ICommand, IRequest<bool>
+    public class CreateOrderCommand : ICommand<bool>
     {
         
         [DataMember]

src/Services/Ordering/Ordering.API/Application/Commands/CreateOrderDraftCommand.cs

@@ -10,7 +10,7 @@ using static Microsoft.eShopOnContainers.Services.Ordering.API.Application.Comma
 
 namespace Microsoft.eShopOnContainers.Services.Ordering.API.Application.Commands
 {
-    public class CreateOrderDraftCommand : ICommand, IRequest<OrderDraftDTO>
+    public class CreateOrderDraftCommand : ICommand<OrderDraftDTO>
     {
         public Guid CommandId { get; }
 

src/Services/Ordering/Ordering.API/Application/Commands/ShipOrderCommand.cs

@@ -8,7 +8,7 @@ using Microsoft.eShopOnContainers.Services.Ordering.API.Application.Commands;
 
 namespace Ordering.API.Application.Commands
 {
-    public class ShipOrderCommand : ICommand, IRequest<bool>
+    public class ShipOrderCommand : ICommand<bool>
     {
         public Guid CommandId { get; set; }