Support PHP 8 and Nette 3

[janbarasek]

Hi!

Are you planning to add native support for PHP 8 and Nette 3 in the near future? It could be a new master version.

If you would be interested in upgrading, I can send a Pull request.

Thanks.

[ondrs]

All contributions are welcomed!
Can you please make the upgrade BC compatible? It's a very tiny library, there is no need to have a breaking change because of PHP8 and Nette3

[janbarasek]

Adding data types is a BC break or not?

[ondrs]

Currently, it supports PHP 5.4 which is probably unnecessary.
We can drop support for lower versions than PHP 7.1 so types can be added.