Amend change log for v21.0.1.
Amend change log for v21.0.1.

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