Remove unused standard library require statements
Remove unused standard library require statements

local-ch/omniauth-oauth2,billy-ran-away/omniauth-oauth2,Cloverhound/omniauth-ciscospark,intridea/omniauth-oauth2,bino98/omniauth-misoca-oauth2,k-tada/omniauth-oauth2,txssseal/omniauth-oauth2