Fix all lint errors

proxy/trafficrwc.go

@@ -2,24 +2,29 @@ package proxy
 
 import "io"
 
+// TrafficReadWriteCloser counts an amount of ingress/egress traffic by
+// calling given callbacks.
 type TrafficReadWriteCloser struct {
 	conn          io.ReadWriteCloser
 	readCallback  func(int)
 	writeCallback func(int)
 }
 
+// Read reads from connection
 func (t *TrafficReadWriteCloser) Read(p []byte) (n int, err error) {
 	n, err = t.conn.Read(p)
 	t.readCallback(n)
 	return
 }
 
+// Write writes into connection.
 func (t *TrafficReadWriteCloser) Write(p []byte) (n int, err error) {
 	n, err = t.conn.Write(p)
 	t.writeCallback(n)
 	return
 }
 
+// Close closes underlying connection.
 func (t *TrafficReadWriteCloser) Close() error {
 	return t.conn.Close()
 }