Added class Json.

src/common/interfaces/IConfig.h

@@ -4,7 +4,9 @@
  * Copyright 2014      Lucas Jones <https://github.com/lucasjones>
  * Copyright 2014-2016 Wolf9466    <https://github.com/OhGodAPet>
  * Copyright 2016      Jay D Dee   <jayddee246@gmail.com>
- * Copyright 2016-2018 XMRig       <support@xmrig.com>
+ * Copyright 2017-2018 XMR-Stak    <https://github.com/fireice-uk>, <https://github.com/psychocrypt>
+ * Copyright 2018-2019 SChernykh   <https://github.com/SChernykh>
+ * Copyright 2016-2019 XMRig       <https://github.com/xmrig>, <support@xmrig.com>
  *
  *   This program is free software: you can redistribute it and/or modify
  *   it under the terms of the GNU General Public License as published by
@@ -125,7 +127,7 @@ public:
         CudaMaxUsageKey   = 1206,
     };
 
-    virtual ~IConfig() {}
+    virtual ~IConfig() = default;
 
     virtual bool finalize()                                = 0;
     virtual bool isWatch() const                           = 0;