[-] Remove method to add extra serialized props. This does not work, and the prop being added was already included.

src/structures/Base.js

@@ -17,23 +17,6 @@ class Base {
       }
     
     _patch(data) { return data; }
-
-    /**
-     * Name that represents this model in the WhatsApp Web Store
-     * @readonly
-     */
-    static get WAppModel() {
-        return this.name;
-    }
-
-    /**
-     * Extra fields to add to model serialization 
-     * @readonly
-     */
-    static get extraFields() {
-        return [];
-    }
-
 }
 
 module.exports = Base;