Add missing SecurityCritical attribute

Fixes #1471

Octokit/Exceptions/ApiException.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Net;
 using System.Runtime.Serialization;
+using System.Security;
 using Octokit.Internal;
 
 namespace Octokit
@@ -158,6 +159,7 @@ namespace Octokit
             ApiError = (ApiError) info.GetValue("ApiError", typeof(ApiError));
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/RateLimitExceededException.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -94,6 +95,7 @@ namespace Octokit
                          ?? new RateLimit(new Dictionary<string, string>());
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/RepositoryExistsException.cs

@@ -2,6 +2,7 @@
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -117,6 +118,7 @@ namespace Octokit
             ExistingRepositoryWebUrl = (Uri) info.GetValue("ExistingRepositoryWebUrl", typeof(Uri));
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/RepositoryFormatException.cs

@@ -3,6 +3,7 @@ using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -51,6 +52,7 @@ namespace Octokit
             message = info.GetString("Message");
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/RepositoryWebHookConfigException.cs

@@ -4,6 +4,7 @@ using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Linq;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -48,6 +49,7 @@ namespace Octokit
             message = info.GetString("Message");
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/TwoFactorAuthorizationException.cs

@@ -3,6 +3,7 @@ using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Net;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -80,6 +81,7 @@ namespace Octokit
             TwoFactorType = (TwoFactorType) info.GetInt32("TwoFactorType");
         }
 
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Exceptions/TwoFactorChallengeFailedException.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.Serialization;
+using System.Security;
 
 namespace Octokit
 {
@@ -64,7 +65,7 @@ namespace Octokit
             if (info == null) return;
             AuthorizationCode = info.GetString("AuthorizationCode");
         }
-
+        [SecurityCritical]
         public override void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             base.GetObjectData(info, context);

Octokit/Http/RateLimit.cs

@@ -4,6 +4,7 @@ using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Runtime.Serialization;
+using System.Security;
 using Octokit.Helpers;
 using Octokit.Internal;
 
@@ -82,6 +83,7 @@ namespace Octokit
             ResetAsUtcEpochSeconds = info.GetInt64("ResetAsUtcEpochSeconds");
         }
 
+        [SecurityCritical]
         public virtual void GetObjectData(SerializationInfo info, StreamingContext context)
         {
             Ensure.ArgumentNotNull(info, "info");