feat(model): handle 'data' wrapped responses for create and update (#109)

Laravel allows data wrapping for all responses, so create and update requests should support this if it is done.

Author: fadugyamfi

src/Model.js

@@ -370,7 +370,7 @@ export default class Model extends StaticModel {
       url: this.endpoint(),
       data: this
     }).then(response => {
-      return this._applyInstance(response.data)
+      return this._applyInstance(response.data.data || response.data)
     })
   }
 
@@ -380,7 +380,7 @@ export default class Model extends StaticModel {
       url: this.endpoint(),
       data: this
     }).then(response => {
-      return this._applyInstance(response.data)
+      return this._applyInstance(response.data.data || response.data)
     })
   }