Bukkit

• New worldconfig.yml and landdefault.yml format
• Updated to 1.14 API
• Now compatible with command completions
• Fix TENANT and OWNER inheritance
• More catches and verbose errors on loading
• Fix glitches on visual selection
• Add some new flags and permissions
• Many small fixes

If you are upgrading from 1.3.x, your worldconfig.yml and landdefault.yml will be no longer working. You need to do those steps:

1. Stop your Minecraft server
2. Rename worldconfig.yml and landdefault.yml to worldconfig.yml.bak and landdefault.yml
   
3. Restart your Minecraft server and new files will be regenerated

You need to push back manually your modifications. There is no automatic conversion. Sorry.