Laravel 10 support

Updated readme

Added better language support; Refactored test cases; Added missing t…

…ype definitions

Added laravel 8 support (korridor#7)

Added link to coverage report

Formatted code (StyleCI)

Merge pull request korridor#1 from korridor/feature/unique_eloquent

Added UniqueEloquent rule; Renamed ExistEloquent to ExistsEloquent

Advanced language support

Fixed readme