Add support for multiple webhooks (#615)

src/WireMock.Net/Mapping.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Threading.Tasks;
 using JetBrains.Annotations;
-using WireMock.Admin.Mappings;
 using WireMock.Matchers.Request;
 using WireMock.Models;
 using WireMock.ResponseProviders;
@@ -56,8 +55,8 @@ namespace WireMock
         /// <inheritdoc cref="IMapping.LogMapping" />
         public bool LogMapping => !(Provider is DynamicResponseProvider || Provider is DynamicAsyncResponseProvider);
 
-        /// <inheritdoc cref="IMapping.Webhook" />
-        public IWebhook Webhook { get; }
+        /// <inheritdoc cref="IMapping.Webhooks" />
+        public IWebhook[] Webhooks { get; }
 
         /// <summary>
         /// Initializes a new instance of the <see cref="Mapping"/> class.
@@ -73,7 +72,7 @@ namespace WireMock
         /// <param name="executionConditionState">State in which the current mapping can occur. [Optional]</param>
         /// <param name="nextState">The next state which will occur after the current mapping execution. [Optional]</param>
         /// <param name="stateTimes">Only when the current state is executed this number, the next state which will occur. [Optional]</param>
-        /// <param name="webhook">The Webhook. [Optional]</param>
+        /// <param name="webhooks">The Webhooks. [Optional]</param>
         public Mapping(
             Guid guid,
             [CanBeNull] string title,
@@ -86,7 +85,7 @@ namespace WireMock
             [CanBeNull] string executionConditionState,
             [CanBeNull] string nextState,
             [CanBeNull] int? stateTimes,
-            [CanBeNull] IWebhook webhook)
+            [CanBeNull] IWebhook[] webhooks)
         {
             Guid = guid;
             Title = title;
@@ -99,7 +98,7 @@ namespace WireMock
             ExecutionConditionState = executionConditionState;
             NextState = nextState;
             StateTimes = stateTimes;
-            Webhook = webhook;
+            Webhooks = webhooks;
         }
 
         /// <inheritdoc cref="IMapping.ProvideResponseAsync" />