Update copyright headers

auth/callbacks.go

auth/confirm.go

auth/fmt.go

auth/fmt_test.go

auth/interface.go

auth/params.go

auth/receivedConfirm.go

auth/receivedRequest.go

auth/replayConfirm.go

auth/request.go

auth/reset.go

auth/sentRequestHandler.go

auth/state.go

auth/state_test.go

auth/store/confirmation.go

auth/store/confirmation_test.go

auth/store/deletion.go

auth/store/fingerprint.go

auth/store/previousNegotiations.go

auth/store/previousNegotiations_test.go