Compatibility with 'schema_metatag' version 3.x

I tested the changes from the issue fork above without any problems.

Hi @RumenDamyanov thank you for your patch but it is not related to this issue, you should open another issue specific to add a composer.json file

Please, don't remove the composer.json file from the repo as it's required from composer to be able to install the package from the issue fork repo instead of the original package repo.

I close the issue as Done.
@Rumen please open an additional issue about the missing composer.json and post it there. Thank you.

Automatically closed - issue fixed for 2 weeks with no activity.