Changes

Summary

1. add difficulty option (commit: a9ded29) (details)

Commit a9ded29d823de2ef48a6b5f68613d55c1e143be1 by Flo.e3 add difficulty option (commit: a9ded29)
	src/main/java/codecrafter47/multiworld/api/WorldConfiguration.java (diff)
	src/main/java/codecrafter47/multiworld/commands/MainCommand.java (diff)
	src/main/java/codecrafter47/multiworld/manager/WorldManager.java (diff)