lint fixes (#14)

* lint fixes

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

tunnel/broker/broker.go

@@ -24,11 +24,6 @@ type tunSubscriber struct {
 	listener tunnel.Listener
 }
 
-type tunEvent struct {
-	topic   string
-	message *broker.Message
-}
-
 // used to access tunnel from options context
 type tunnelKey struct{}
 type tunnelAddr struct{}
@@ -149,22 +144,6 @@ func (t *tunSubscriber) Unsubscribe() error {
 	}
 }
 
-func (t *tunEvent) Topic() string {
-	return t.topic
-}
-
-func (t *tunEvent) Message() *broker.Message {
-	return t.message
-}
-
-func (t *tunEvent) Ack() error {
-	return nil
-}
-
-func (t *tunEvent) Error() error {
-	return nil
-}
-
 func NewBroker(opts ...broker.Option) broker.Broker {
 	options := broker.Options{
 		Context: context.Background(),