Tested and working on Paper Spigot 1.16.1 (https://papermc.io)

This is a Minecraft 1.16.1 plugin for Spigot/Paper/Bukkit with heavily commented code incase you're a learner.

It currently has a couple features:

Only a single player needs to sleep in order to change the time to day.

• Checks if the player is still sleeping before changing the time
• Only changes the time once, incase multiple people have slept at the same time.

Drops mob heads when they're killed by players.

• Not all mobs added yet

Apparently they do this in HermitCraft.

• Future versions will allow this to be toggled

• Makes shulkers drop 2 shells on death

• Prevents endermen from taking random blocks

• Disables fire from spreading

Sets the world border on server start

• Centered @ 0, 0
• 12k size, 6k out in each direction