This is compatible with 1.11 (EntityDamageByEntityEvent changed slightly, otherwise 15.3 would've been fully compatible with 1.11)
Please note that the fast/faster accrual rate and more/most/whatever claim block limits have been removed. Please save these values from your config if you wish to use them in an addon that re-adds this feature (and if nobody else wants to make this addon... I'll make it when I have time and not tired).