Fix CA errors.

Author: grokys

src/GitHub.Api/IncorrectScopesException.cs

@@ -1,10 +1,12 @@
 using System;
+using System.Runtime.Serialization;
 
 namespace GitHub.Api
 {
     /// <summary>
     /// Thrown when the login for a user does not have the required scopes.
     /// </summary>
+    [Serializable]
     public class IncorrectScopesException : Exception
     {
         public IncorrectScopesException()
@@ -16,5 +18,15 @@ public IncorrectScopesException(string message)
             : base(message)
         {
         }
+
+        public IncorrectScopesException(string message, Exception innerException)
+            : base(message, innerException)
+        {
+        }
+
+        protected IncorrectScopesException(SerializationInfo info, StreamingContext context) 
+            : base(info, context)
+        {
+        }
     }
 }

src/GitHub.App/Api/ApiClient.cs

@@ -23,8 +23,6 @@ public partial class ApiClient : IApiClient
         static readonly ILogger log = LogManager.ForContext<ApiClient>();
 
         readonly IObservableGitHubClient gitHubClient;
-        readonly static Lazy<string> lazyNote = new Lazy<string>(() => ProductName + " on " + GetMachineNameSafe());
-        readonly static Lazy<string> lazyFingerprint = new Lazy<string>(GetFingerprint);
 
         string ClientId { get; set; }
         string ClientSecret { get; set; }