set the ITcpService interface's destroy function is virtual.

Author: IronsDu

include/brynet/base/Timer.hpp

@@ -76,7 +76,7 @@ class Timer final
     friend class TimerMgr;
 };
 
-class RepeatTimer
+class RepeatTimer final
 {
 public:
     using Ptr = std::shared_ptr<RepeatTimer>;

include/brynet/net/TcpService.hpp

@@ -12,6 +12,7 @@ class ITcpService
     using Ptr = std::shared_ptr<ITcpService>;
 
 public:
+    virtual ~ITcpService() = default;
     virtual bool addTcpConnection(TcpSocket::Ptr socket, ConnectionOption options) = 0;
 };