Add more notes about changes in 8.0.0
Add more notes about changes in 8.0.0

KMikhaylovCTG/pyechonest,diCaminha/pyechonest,ruohoruotsi/pyechonest,mmiquiabas/pyechonest,EliteScientist/pyechonest,beni55/pyechonest,taytorious/pyechonest,wisperwinter/pyechonest,EliteScientist/pyechonest,yuanmeibin/pyechonest,salah-ghanim/pyechonest,KMikhaylovCTG/pyechonest,mmiquiabas/pyechonest,diegobill/pyechonest,abhisheknshah/dynamicplaylistgenerator,echonest/pyechonest,shyamalschandra/pyechonest,diCaminha/pyechonest,diegobill/pyechonest,MathieuDuponchelle/pyechonest3,beni55/pyechonest,echonest/pyechonest,DaisukeMiyamoto/pyechonest,ruohoruotsi/pyechonest,DaisukeMiyamoto/pyechonest,salah-ghanim/pyechonest,mhcrnl/pyechonest,krishofmans/pyechonest,abhisheknshah/dynamicplaylistgenerator,Victorgichohi/pyechonest,mhcrnl/pyechonest,taytorious/pyechonest,andreylh/pyechonest,esternocleidomastoideo/pyechonest,shyamalschandra/pyechonest,Victorgichohi/pyechonest,yuanmeibin/pyechonest,esternocleidomastoideo/pyechonest,MathieuDuponchelle/pyechonest3,andreylh/pyechonest,krishofmans/pyechonest,wisperwinter/pyechonest