GitHub for Visual Studio 2.5.4 release

The release of GitHub for Visual Studio 2.5.4 includes the following enhancements:

We now use GraphQL for pull request models provided by the Ocktokit.NET library, which has greatly improved the performance for listing Pull Requests. In addition, you can now open links in Visual Studio that have been copied to the clipboard from GitHub.com to provide easier navigation from GitHub to the editor.