Fix linters

wrappers/trafficrwc.go

@@ -29,6 +29,7 @@ func (t *TrafficReadWriteCloser) Close() error {
 	return t.conn.Close()
 }
 
+// NewTrafficRWC wraps ReadWriteCloser to have read/write callbacks.
 func NewTrafficRWC(conn io.ReadWriteCloser, readCallback, writeCallback func(int)) io.ReadWriteCloser {
 	return &TrafficReadWriteCloser{
 		conn:          conn,