A new plugin update is out, finally!
You need to migrate from 2.1.x? Follow this link to get all details.

What's new?

• Support Minecraft 1.13, 1.14, 1.15, 1.16
• Pagination system to display a large amount of chests (more than 54!)
• New integration with EssentialsX (bypass /enderchest command)
• Connect to a MySQL database over SSL
• Modify sound when a player cannot open an enderchest
• A large source code rework and optimization

What's fixed?

• Fix a bad behavior with the click in player's inventory
• Prevent drag/drop in restricted menus
• Remove unsafe SQL requests

I strongly apologize for the lack of update since 2018!
I will do better in the future, especially because I continue to develop the plugin even without posting releases..

Need help? Open an issue, I will be happy to discuss with you!