Fix capitalisation and grammar in README.md
Fix capitalisation and grammar in README.md

ppy/osu,smoogipoo/osu,EVAST9919/osu,UselessToucan/osu,smoogipoo/osu,johnneijzen/osu,ppy/osu,EVAST9919/osu,UselessToucan/osu,NeoAdonis/osu,2yangk23/osu,NeoAdonis/osu,2yangk23/osu,ppy/osu,peppy/osu,peppy/osu-new,peppy/osu,smoogipooo/osu,smoogipoo/osu,UselessToucan/osu,peppy/osu,NeoAdonis/osu,johnneijzen/osu