Fix crash during answer

tests/signal_client/signal_client.cpp

@@ -1,51 +0,0 @@
-#include "ws_client.h"
-
-#include <cstdlib>
-#include <iostream>
-#include <string>
-#include <sstream>
-
-class WsReceiver:public WsCore
-{
-public:
-    WsReceiver(){}
-    ~WsReceiver(){}
-
-    void OnReceiveMessage(const std::string &msg)
-    {
-        LOG_INFO("Receive msg: {}", msg);
-    }
-};
-
-int main()
-{
-    bool done = false;
-    std::string input;
-    WsReceiver ws_client;
-
-    LOG_INFO("connect ws://localhost:9002");
-    ws_client.Connect("ws://localhost:9002");
-
-    std::string status1 = ws_client.GetStatus();
-
-    while("Open" != status1)
-    {
-        status1 = ws_client.GetStatus();
-    }
-    
-    LOG_INFO("Connect successfully!");
-
-    LOG_INFO("Send message [Hello]");
-    ws_client.Send("Hello");
-
-    LOG_INFO("Send ping");
-    ws_client.Ping();
-
-    LOG_INFO("Close conneciton");
-    int close_code = websocketpp::close::status::normal;
-    std::string reason = "User Close";
-    ws_client.Close(close_code, reason);
-
-    getchar();
-    return 0;
-}