Add support for PHP 8

[uziel-bueno]

Hello!

I inherited a proejct which uses this great package but we are having issues
installing some dependencies in a PHP 8 environment.

Are there any plans to update it for PHP 8?

Much appreciated.

[igomis]

I've got the same problem

[emejiasc85]

Same problem styde/html 1.9.1 requires php ^7.2 -> your php version (8.0.21) does not satisfy that requirement.

any plans to update?

please