Fix fontawesome url
Fix fontawesome url

It currently redirect to https://murhafsousli.github.io/ng2-sharebuttons/fontawesome.io
tinesoft/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons,tinesoft/ng2-sharebuttons,tinesoft/ng2-sharebuttons,MurhafSousli/ng2-sharebuttons