What's new

• Update checker - PlayerTrade now checks SpigotMC on startup and lets you know if a newer version is available.
• In-game notifications - players with the playertrade.update permission (ops by default) get a clickable [Download] message when they join if an update is out.
• Console logging - you'll see an "up to date" or "new version available" line in the server log on startup.

New permission

• playertrade.update (default: op) - controls who sees the in-game update notification.

Notes
The check runs asynchronously with a 5-second timeout, so it won't impact server startup or performance. No configuration required - just drop in the new jar and reload.