Laravel Rule class is deprecated

[DMidDeloitte]

The ArrayRules class of this library implements the Illuminate\Contracts\Validation\Rule interface from laravel/framework.

However, this interface states:
@deprecated see ValidationRule
Which I believe references the class Illuminate/Contracts/Validation/ValidationRule.php

As such it would be good to already make changes to switch over to the new interface (if possible).
However, this might require a new major version as probably not all versions of laravel/framework have this interface (unsure).

[bashgeek]

It's deprecated, but working fine and as far as I know there are no plans to remove the old interface. Feel free to provide a PR though.