Change naming convention of class properties

src/core/dns/include/Record.hpp

@@ -14,9 +14,9 @@ using std::string;
 class Record : public Resource
 {
     public:
-    const uint16_t id_;
+    const uint16_t _id;
     string serialize();
-    Record(const uint16_t id) : id_(id) {}
+    Record(const uint16_t id) : _id(id) {}
 };
 
 class ARecord : public Record { ARecord(); };