[readme] fixed typos
[readme] fixed typos

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