Please update README.md

[jagDanJu]

Hey,

please update your readme.md file. Some parts are in laravel 4 style:

// config/app.php

'providers' => [
...
'Spatie\Backup\BackupServiceProvider',
...
];

it must be:

// config/app.php

'providers' => [
...
Spatie\Backup\BackupServiceProvider::class,
...
];

[freekmurze]

This package is compatible with Laravel 5.0 / PHP5.4. ::class was introduced in PHP5.5.