Symfony 4.4 notify deprecation

[akinfiyev]

Hi! Env: Symfony 4.4.3, PHP 7.3.13, stfalcon/tinymce-bundle v2.5.0 Profiler notify about The "Symfony\Component\Config\Definition\Builder\TreeBuilder::root()" method called for the "stfalcon_tinymce" configuration is deprecated since Symfony 4.3, pass the root name to the constructor instead. Upgrade to Symfony 5.0 is not a variant, as we are using LTS only. Thank you!