Funktions

• Set the maximum height with "/hbset"
• Read out the maximum height with "/heightlimit"
• Configurate the massege that a player gets when making contact with the heightborder
• set the permissions for bypassing etc.

More about versions
For now just tested in versions 1.13 and higher but on request i can send you the plugin for lower versions.

Commands

• hbset + valid number: set your heightLimit (needs permission "height.set")
• heightlimit: shows the setted maximum height of your world.

Permissions:

• height.set: set the maximum height
• height.bypass: to bypass the heightborder