Release v0.24 - A Sight For Sore Eyes (#1539)

* Add release notes and bump version to 0.24

* run "build FormatCode" to fix up whitespace/formatting issues

* Fix failing Ssh key tests due to "validation exception".  This key must be in use on github (under another user, most likely from these tests failing).  Changed to a new SSH key and tweaked tests to reduce chance of a key being created and not destroyed

* Assignee and Assignees cant both be specified on NewIssue.  We missed this one in the PR.  Marked Assignee as [Obsolete] and fixed tests to use Assignees

* Fix a couple of Reactions tests that were calling the wrong client methods

* Fix timeline tests - looks like the response class has changed shape a bit, it now has an Issue object in the payload and Id field isnt present (leaving Id field there in case other timeline events do use it)

* Fix some following tests that require the test user to follow more than 1 other user

* Unskip these Event tests now because apparently they work!

* add breaking changes notes

* Update ApiErrorMessageSafe to return null for empty and whitespace strings (#1540)

* return null if ApiError.Message is empty or whitespace

* Uncomment test, which now passes

* update release notes to include PR1540

* Add "Bot" AccountType, was causing a deserialization exception when running the integration test "SearchForExcludedLanguage" (#1541)

* Update to include PR1541

* add bullets to make release notes easier to read

* markup additional code mentions in notes

* Fix grammar

fields => field

Octokit.Tests.Integration/Clients/MigrationsClientTests.cs

@@ -81,11 +81,11 @@ public class MigrationsClientTests : IDisposable
     {
         while (!isExported)
         {
-            Thread.Sleep(2000);    
+            Thread.Sleep(2000);
         }
 
         var contents = await _gitHub.Migration.Migrations.GetArchive(_orgName, _migrationContext.Id);
-        
+
         Assert.NotEmpty(contents);
     }
 
@@ -127,6 +127,6 @@ public class MigrationsClientTests : IDisposable
 
     public void Dispose()
     {
-        _repos.ForEach( (repo) => repo.Dispose() );
+        _repos.ForEach((repo) => repo.Dispose());
     }
 }