Update composer.json for Laravel 8.0

[adelinferaru]

Please update the require part of the composer.json so that we can upgrade to Laravel 8.0 ( add |^8.0 )

"require": {
        "php": ">=7.1.3",
        "illuminate/support": "~5.7.0|~5.8.0|^6.0|^7.0",
        "illuminate/database": "~5.7.0|~5.8.0|^6.0|^7.0",
        "illuminate/events": "~5.7.0|~5.8.0|^6.0|^7.0"
    },

Thank you!

[tumichnix]

See PR #472