Update gradle-versions-plugin to 0.8.
Update gradle-versions-plugin to 0.8.

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