…xample

When an entity is being saved, nulls are considered as existing entities, so it tries to update and not insert.

…obsontenorio#109)

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

)

* feat(utils): add utilities `getProp` and `setProp`

* feat(model): add support to nested keys for relations

* test(model): test support of nested keys for relations

* test(utils): test utilities

* chore: update readme

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)
- [Commits](node-fetch/node-fetch@v2.6.0...v2.6.1)

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