Tag version

Could you please tag versions of the package so we can lock to a specific version in our composer dependencies? For example, we are unable to use this commit currently as our PHP requirements are `>=7.2.0` to match Laravel 6.x.
https://github.com/andywer/laravel-js-localization/commit/54e713e937e2da0b0b65cafadb438f1c26c09648#diff-b5d0ee8c97c7abd7e3fa29b9a27d1780

