You never like waiting for plugins to update. That's why I quickly updated to Minecraft 1.13. Statz will now run on Spigot 1.13 servers! You can only run this version on MC 1.13 server software (so no Spigot 1.12.2).
Before you upgrade, please do make a backup of your database! If you lose data, you can revert to the old database.
Make sure to update PluginLibrary and Autorank as well!