feat(model): apply relations on construct

Author: JoaoPedroAS51

Diff for: src/Model.js

@@ -10,6 +10,7 @@ export default class Model extends StaticModel {
       this._builder = new Builder(this)
     } else {
       Object.assign(this, ...attributes)
+      this._applyRelations(this)
     }
 
     if (this.baseURL === undefined) {
@@ -237,8 +238,6 @@ export default class Model extends StaticModel {
       item._from(this._fromResource)
     }
 
-    this._applyRelations(item)
-
     return item
   }