Update to work with Laravel 6

[Chris Leah]

Can you please, update this to work with Laravel 6?

Composer issue:
`Your requirements could not be resolved to an installable set of packages.

Problem 1
- Conclusion: remove laravel/framework v6.0.1
- Conclusion: don't install laravel/framework v6.0.1`

[Freek Van der Herten]

I just tagged a L6 compatible release.