LevelledMobs v3.1.8 b517
Hey there - here's an update with a bunch of fixes and improvements! The changelog is below.

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Changelog:
The following changes by stumper66:

• fixed MythicMobs 5.0 compatibility
• using Essentials' /spawnmob command with player levelling will no longer relevel it after being spawned in
• setting player-levelling-relevel-min-time to 0 will cause it to never relevel
• player levelling will not check NPCs from Citizens plugin anymore
• player levelling now uses a more efficient algorithm to determine the closest player to a given mob (thanks @Hugo5551#4042 )
• player-levelling-mob-distance-squared in settings.yml is longer used and will be removed in a future build