fixup! implementing encoder interface

Author: andreagilardoni

src/cbor/CborEncoder.h

@@ -36,19 +36,17 @@ class CBORMessageEncoderInterface {
 class CBORMessageEncoderClass: public Encoder {
 public:
   static CBORMessageEncoderClass& getInstance() {
-    static CBORMessageEncoderClass singleton;
-
     return singleton;
   }
 
   void append(CBORTag id, CBORMessageEncoderInterface* encoder) {
-    // auto pair = encoders.try_emplace(id, encoder);
     encoders[id] = encoder;
   }
 
   Encoder::Status encode(Message* message, uint8_t * data, size_t& len);
 private:
   std::map<MessageId, CBORMessageEncoderInterface*> encoders;
+  static CBORMessageEncoderClass singleton;
 };
 
 extern CBORMessageEncoderClass& CBORMessageEncoder;