Holiday calculation functions in providers are private, could those be protected instead?

[attepulkkinen]

I think the holiday calculation functions in the provider classes should be protected instead of private (as discussed here #276), this would make it much easier to extend the current providers as I don't have to copy-paste functions from the parent class to use them in extending class. For example:

yasumi/src/Yasumi/Provider/Finland.php

Line 153 in 59e2bf6

private function calculateIndependenceDay(): void

yasumi/src/Yasumi/Provider/Greece.php

Line 114 in 59e2bf6

private function calculateCleanMonday(): void

yasumi/src/Yasumi/Provider/Luxembourg.php

Line 109 in 59e2bf6

private function calculateNationalDay(): void

I can provide pull-request if needed

[stelgenhof]

Hi @attepulkkinen Thank you very much for raising this. Indeed as per the #276 discussion, these methods can be changed to protected. I haven't actively changed this for all the providers (yet).

I would indeed appreciate if you could create a PR for this.