Prepare version 20.1.0-beta1.
Prepare version 20.1.0-beta1.

artemnikitin/SeriesGuide,0359xiaodong/SeriesGuide,hoanganhx86/SeriesGuide,UweTrottmann/SeriesGuide,UweTrottmann/SeriesGuide,r00t-user/SeriesGuide,epiphany27/SeriesGuide