StarterExtension - v1.3.0

Hey!

There are few changes in this update.

All changes:

• Updated to latest RandomLootChest version,
• Updated to Java 16 (like RandomLootChest),

StarterExtension - v1.2.0

Hey!

There's small update to StarterExtension that provides support to the latest RandomLootChest version:

All changes:

• Updated RandomLootChest API to 1.8.0-BETAv1,
• Minor changes in code
• Compiled Java 11