Drupal 11 Compatibility

Think this is all that is required to make it installable in Drupal 11.

Hi, kevinquillen!

I am away from a computer at the moment, but when I get a chance, I'll review and merge this in to prepare a D11 release. Thanks for the heads-up and the MR.

The module lacks a composer.json, so I cannot require a forked version via Composer.