Change log for 21.1.0-beta2.
Change log for 21.1.0-beta2.

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