[minor] Update file header and indentation in http-signature.js
[minor] Update file header and indentation in http-signature.js

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