PHP code in Tag V2.2 not compatible with composer.json requirements

[HugoSantiagoBecerraAdan]

https://packagist.org/packages/fbeen/uniqueslugbundle#V2.2
https://github.com/Fbeen/UniqueSlugBundle/tree/V2.2

Implementation in tag V2.2 uses features from PHP not compatible with minimum version 7.0.8 declared in composer.json

https://github.com/Fbeen/UniqueSlugBundle/blob/V2.2/composer.json#L20

Incompatible features:

• void return type declaration
• object argument type declaration

Can you create a support branch for fixing issues in version 2.2?? I will contribute with the necessary changes to that branch so you can create a tag V2.2.1.