ADDED:
New message system
Placeholder examples in messages.yml

FIXED:
Fix reload command requires player on console
Fixed EventController throws error when left-click air

REMOVED:
Old serializing system

If you are using version before v0.5 , don't upgrade to this version, it WILL break the game. You can delete all files from playerdata folder or upgrade to any version before this version to and let player connect to your server to safely convert all grave to new system.