Support Laravel 8

Update composer.json

Merge pull request #23 from martindilling/patch-1

Use `Arr::get` instead of the deprecated `array_get`

Merge pull request #19 from djoudi/master

support Laravel 6

Merge pull request #14 from petersuhm/5.8-support

Update composer.json to support L5.8

Merge pull request #8 from usamaejaz/master

Allow package to be installed by laravel 5.7.*

Re-format to spaces

Merge pull request #2 from HelgeSverre/master

Add "nextUnfinishedStep" method

Update README.md