Visual Studio gives warning CS1998 on lambda function

[jasonjoh]

This async method lacks 'await' operators and will run synchronously. Consider using the 'await' operator to await non-blocking API calls, or 'await Task.Run(...)' to do CPU-bound work on a background thread.

This is the offending code:

var graphClient = new GraphServiceClient(
    new DelegateAuthenticationProvider(
        async (requestMessage) =>
        {
            requestMessage.Headers.Authorization =
                new AuthenticationHeaderValue("Bearer", accessToken);
        }));

[jasonjoh]

Fixed in #48