Fix unlimited Features

Fix a logic error in the limit getter for a class. If there is no limit (limit is set to 0), the check has to return null.

Upgrade to php 8.1

• Upgrade dependencies to php 8.1
• Add possibility to check if a plan has a specific feature

Fix Laravel 9 Compatibility

update to laravel 9

Fix Laravel 8 Compatibility

Merge pull request #1 from holozaen/laravel-8

update to laravel 8 compat

Allow Laravel 8.0

0.5.3

update dependencies

Fix to some more signatures

0.5.2

fix some more definitions

Fix to payment tolerance

0.5.1

fix payment tolerance definition

Allow Laravel 7.0

0.5.0

Merge remote-tracking branch 'origin/master'

Fix migration filenames

0.4.9

rename migrations

change to array for limit info

0.4.8

limits attribute in subscription as array instead of object