[doc] Update README.md
[doc] Update README.md

DonSchenck/pkgcloud,Phanatic/pkgcloud,bunglestink/pkgcloud,Phanatic/pkgcloud,apla/pkgcloud,temka1234/pkgcloud,hacor/pkgcloud,mdsummers/pkgcloud,Hopebaytech/pkgcloud,songanbui/pkgcloud,andrewsomething/pkgcloud,pkgcloud/pkgcloud,dionjwa/pkgcloud,mcanthony/pkgcloud