Fixes #1621 NewRepositoryWebHook no longer creates new instance... (#1623)

Fixes #1621 NewRepositoryWebHook should not discard existing fields

Octokit/Exceptions/RepositoryWebHookConfigException.cs

@@ -1,62 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Diagnostics.CodeAnalysis;
-using System.Globalization;
-using System.Linq;
-#if !NO_SERIALIZABLE
-using System.Runtime.Serialization;
-#endif
-using System.Security;
-
-namespace Octokit
-{
-#if !NO_SERIALIZABLE
-    [Serializable]
-#endif
-    [SuppressMessage("Microsoft.Design", "CA1032:ImplementStandardExceptionConstructors",
-        Justification = "These exceptions are specific to the GitHub API and not general purpose exceptions")]
-    public class RepositoryWebHookConfigException : Exception
-    {
-        readonly string message;
-
-        public RepositoryWebHookConfigException(IEnumerable<string> invalidConfig)
-        {
-            var parameterList = string.Join(", ", invalidConfig.Select(ic => ic.FromRubyCase()));
-            message = string.Format(CultureInfo.InvariantCulture,
-                "Duplicate webhook config values found - these values: {0} should not be passed in as part of the config values. Use the properties on the NewRepositoryWebHook class instead.",
-                parameterList);
-        }
-
-        public override string Message
-        {
-            get { return message; }
-        }
-
-#if !NO_SERIALIZABLE
-        /// <summary>
-        /// Constructs an instance of RepositoryWebHookConfigException
-        /// </summary>
-        /// <param name="info">
-        /// The <see cref="SerializationInfo"/> that holds the
-        /// serialized object data about the exception being thrown.
-        /// </param>
-        /// <param name="context">
-        /// The <see cref="StreamingContext"/> that contains
-        /// contextual information about the source or destination.
-        /// </param>
-        protected RepositoryWebHookConfigException(SerializationInfo info, StreamingContext context)
-            : base(info, context)
-        {
-            if (info == null) return;
-            message = info.GetString("Message");
-        }
-
-        [SecurityCritical]
-        public override void GetObjectData(SerializationInfo info, StreamingContext context)
-        {
-            base.GetObjectData(info, context);
-            info.AddValue("Message", Message);
-        }
-#endif
-    }
-}