remove unnecessary headers

protocol/osc/bundle.h

@@ -23,11 +23,9 @@
 */
 #pragma once
 
-#include "argument.h"
 #include <bufferstream.h>
 #include <memory>
 #include "message.h"
-#include <string>
 #include <vector>
 
 namespace OSC {
@@ -41,7 +39,7 @@ namespace OSC {
  * Inherits from Message as a Bundle may also be a Bundle Element.
  */
 struct Bundle
-  : public Message
+  : Message
 {
   ///@brief Bundle
   Bundle() { address_pattern = "#bundle"; }