Because of compatibility with PHP 8

Merge branch 'laravel-shift-l8-compatibility' into 6.x

Merge pull request LaravelCollective#649 from rogermui/route-param

redo pull request LaravelCollective#627 with backwards compatibility

Merge branch '6.0' into 6.x

Merge pull request LaravelCollective#639 from jasonmccreary/patch-1

Support for Laravel 7

Merge pull request LaravelCollective#619 from jasonmccreary/patch-1

Update constraints to match Laravel 6 releases

Merge pull request LaravelCollective#613 from stephweb/stephweb-6.0

Laravel 6.0 - Refacto compatibility with >=7.2 for tests

Minor fix for PHP 7.2+

Minor fix for PHP 7.2+

Update .travis.yml