I've finished a beta version for 1.13 so if you want a copy you can send me a PM on here. I will only be distributing a few copies during this time and its recommended use is solely for testing.
Provided you receive a copy and discover any errors you can open an issue on the GitHub page so I can address them.
It is not recommended you run this on a public server until diligent testing has been done.
User data may become corrupted or issues may arise when upgrading from a previous version. It is recommended you take a backup of all your data before installing.