Update to 2.1 specification

[bingenito]

Update to 2.1. Checklist and work detailed in #74

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[psmulovics]

Any desire if you are already there changing the tests to be async Task instead of async void?

[bingenito]

Any desire if you are already there changing the tests to be async Task instead of async void?

They were changed from async void to async Task to cleanup warnings in preparation for next xunit release.