Should return the new object

I always have to write like this:

```js
const parabola = {}
const vueapp = {}
defineNestedObject(parabola, 'site.blog_link', () => { })
defineNestedObject(vueapp, '$store.commit', mock)
```

I want to write like this:

```js
const parabola = defineNestedObject({}, 'site.blog_link', () => { })
const vueapp = defineNestedObject({}, '$store.commit', mock)
```
