Maintenance of candidclient as a separate module has been stopped. This client is now being maintained as part of the main candid module at github.com/canonical/candid.
The packages in this module are mapped as:
gopkg.in/CanonicalLtd/candidclient.v1 -> github.com/canonical/candid/candidclient
gopkg.in/CanonicalLtd/candidclient.v1/candidtest -> github.com/canonical/candid/candidtest
gopkg.in/CanonicalLtd/candidclient.v1/params -> github.com/canonical/candid/params
gopkg.in/CanonicalLtd/candidclient.v1/redirect -> github.com/canonical/candid/candidclient/redirect
gopkg.in/CanonicalLtd/candidclient.v1/ussodischarge -> github.com/canonical/candid/candidclient/ussodischarge
gopkg.in/CanonicalLtd/candidclient.v1/ussologin -> github.com/canonical/candid/candidclient/ussologin