Add suport for Nova 5

[niekdemelker]

Don´t know if this just works with Nova 5, but i guess the change is minor for this package, maybe just an update on composer.

[makowskid]

@niekdemelker @ferdiunal

PR created #13

it works for me inside NOVA 5

before @ferdiunal merges, you can use this in your composer.json:

"repositories": [
        {
            "type": "vcs",
            "url": "https://github.com/makowskid/nova-settings"
        }
]