Includes some quality-of-life updates:

• Updated message formatting to include currency symbols. When you update your currency symbol in Essentials now, HeadHunter should use the same symbol in messages.
• Added a config option to change the display name color on heads (head.format.title-color). This option is the color code following the & in normal color formatting. By default this is set to '6', so head titles will be &6, which is gold.

A few bug fixes in this update:

• Fixed a bug that let vanilla wither skeleton skulls drop in addition to HeadHunter skulls.
• Reduced default looting effect from +8% per level to +5% per level (now adds 15% to the drop chance at Looting 3). If you already have HeadHunter installed, you will have to manually change this in config.yml.
  
• Wither skeletons now use default wither skeleton skull items (instead of player head items). This will allow you to get the Advancement for picking up a wither skeleton head while using HeadHunter, and will allow you to spawn the Wither boss with HeadHunter heads.

Added piglin brute heads.

I've added the mob heads for the new mobs in 1.16! You can also now receive different types of zombie villager heads in 1.16.

Found and fixed a bug with locale-specific price formatting. All of you folks using decimal commas should no longer have trouble.

Found and fixed a bug that had the potential to cause severe lag when entities were killed by fire.

Details:
HeadHunter must keep track of what player sets other entities on fire, so that it can drop their heads if they die from fire damage. This change also makes it so that fire damage caused more than one minute ago will not be attributed to the player that caused the fire damage. In most cases, fire damage will not last a full minute. This change is simply to limit any lasting impact HeadHunter has on the server's runtime.

Found and fixed a bug that would prevent heads from dropping in Wilderness if you're using FactionsUUID (or a fork of it).

This HeadHunter update is meant to bring the plugin back up to speed. To install, please delete your old HeadHunter data. You'll lose your signs and placed heads, and you'll lose your bounties as well, unless you follow the new installation instructions.

• Supports Spigot versions 1.8.8 - 1.15
• Supports more Factions plugins
  
• New heads
• Commands are simpler and straightforward
• Added heads that steal their values from the victim when they are sold, rather than when they are dropped (these heads will be marked with a percentage sign on their value tag).
• The configuration is simpler and straightforward

Version 1.4.1a Changes:

• Changed version format to something more readable.
  
• Added support for FactionsUUID.
• Changed records so that bounties must contain more than just the hunter's money to increment the hunter's completed bounties record.
• Stopped heads from dropping when broken by a player in creative mode.
• Fixed Bug: Valid worlds will no longer be reset on server restart.

Version 4.1 Changes:

• Revamping GUI menu code.
• Setting default ignore-worlds option to true.
• Fixing small typo in the configuration.
• Adding support for StackMob.
• Adding records system.
• Adding permission to specify head drop cooldown.
• Adding HeadHunter leaderboards on signs.
• Adding option for more detailed spawn/death reason head drop control.
• Adding HeadHunter API.
• Changing the "hunter.master" permission so that it must be explicitly defined in a player's permission list; being opped will not be enough.
• Adding support for all 1.8 versions, not just the last one (uh, sorry).
• Removing HeadHunter whitelist functionality, commands, and messages. The hunter.nodrop permission must now be explicitly listed in a player's permissions list for it to take effect.

Version 4.0a Changes:

• Fixed hunter.master permission to guarantee a 100% drop chance, from both players and mobs, for players with the permission.
• Attempted to fix an unknown error on death with mcMMO.
• Attempted to fix an unknown error on combust.

Version 4.0 Changes:

• Overhauled the entire plugin. It is much cleaner and much nicer to navigate now, thank you all so much for your patience.
• Renamed HeadHunter's custom events. I sincerely apologize for this change, but I also changed how the events are separated, and how they work.
• Disabled the conversion command. I hope to figure out for sure how I want this command to work, and enable it again in the next version.
• Changed the configuration to be better understandable.
• Moved the general mob head options to config.yml.
  
• Improved the SellHead menu sounds.
  
• Added support for 1.10 and 1.11.
• Added support for the MobStacker plugin.
• Added an option to disable SellHead menu confirmation.
  
• Added every mob head in Minecraft, apart from the Vex and the Ender Dragon.
  
• Fixed every bug known in HeadHunter to-date.

Version 3.4a Changes:

• Added Hoard Mode for mob heads. When enabled, mobs drop worthless heads.
• Changed config usage structure. This should be unnoticeable.
• Added GUI icon material flexibility.
• Improved reliability of GUI icon slot options.
• Added Shulker, Endermite, and Witch heads.
• Removed wanted boards.

Please Read:
This update is certainly not what I had hoped it would be. Recently my computer was seemingly infected with some form of virus, and for safety I decided to abandon half of this update. I removed wanted boards temporarily, because they were causing unexpected issues. Everything in this update has gone untested, however, and I will not be able to provide support until my computer is clean. If you aren't keen to use an untested version of HeadHunter, I recommend reverting to version 3.3a.

Lastly, I'm sorry the update ended up like this. This doesn't meet any of my standards either. Please continue to support the plugin in rough times like this, and I'm sure we'll pull through in no time!

Version 3.4 Changes:

• Added Rabbit, Wolf, and Guardian mob heads.
• Changed how mob head drop limitations work (from spawners and eggs).
• Added custom GUI slot numbers and icon lore flexibility. You can now split most lore lines with two consecutive semicolons (";;") to start a new lore line.
• Fixed bug that caused the GUI total sale value to not update.
• Added maximum value option for dropped heads. If the value of the dropped head is less than the amount specified, the head will be treated as though it's worth $0.00.
• Added wanted boards.

Known Problems:

• Wanted boards are currently a bit touchy. For a currently unknown reason, wanted boards will not survive a server restart. If your server restarts frequently, I recommend waiting until I can get this bug ironed out to add wanted boards to your server.

Version 3.3a Changes:

• Fixed a bug that incorrectly displayed the bounty list GUI title.
• Fixed a bug that used the message settings incorrectly with the selling GUI.
• Added custom events HeadDropEvent, MobHeadDropEvent, and HeadSellEvent.

Version 3.3 Changes:

• Fixed error when using bounty check command.
• Changed convert command to convert only the player's inventory who executed the command.
• Added formatting options for selling GUI.
• Added option to disable dropping heads from spawner-spawned and egg-spawned creatures.
• Added option to drop with specified looting level only.
• Added options for new decapitation enchantment.

Version 3.2 Changes:

• Fixed bug in selling GUI.
• Overhauled selling GUI.
• Added GUI sounds.
• Added option to enable bounty list GUI.
• Added "Godfather Mode" to give bounty heads to the highest bounty setter.

Version 3.1 Changes:

• Returned 1.8 support, in addition to 1.9.
• Removed head-selling from the off hand.
• Fixed size bug in the selling menu.
• Optimized code slightly.
• Returned Minigames support.
• Abandoned combat log plugin support.
  • The release of Minecraft 1.9 has left combat log plugins out-of-date. Please let me know if you're particularly in favor of combat log support.
• Added permission 'hunter.master' to hunt with a 100% chance of drop success.
  • This permission still has lower precedence than world-specifics. In other words, players with this permission can only collect heads in valid worlds.
  • This permission also has lower precedence than head-theft protection. In other words, players with the permission 'hunter.nodrop' will never drop heads, unless they are whitelisted.

Version 3.0 Changes:

• Changed implementation for Spigot 1.9 only.
• Added mob heads.
• Allowed comma-separated decimals.
• Disallowed players to sell their own head through the GUI.

Version 2.3a Changes:

• Fixed the drop.fire-tick functionality.
• Fixed the drop.any-cause functionality.

This will be the last release of HeadHunter for Spigot 1.8, no matter what!

Version 2.3 Changes:

• Added a messages.yml file for easy editing of all HeadHunter messages.
• Reviewed valid players to add a bounty to.
• Added an option to drop heads on any death.
• Added support for deaths caused by Fire Aspect and Flame weapons.
• When sellhead GUIs are enabled, the Sellhead signs now use GUIs too.

Version 2.2a Changes:

• Slightly improving the GUI size option.
• Fixing bug that throws an error in console on the first loadup of HeadHunter 2.2.
  

Version 2.2 Changes:

• Added a GUI menu for selling heads.
• Added a minimum bounty placement option.

Known Problems:

• Using inventory GUIs in Minecraft can be a bit sensitive. Make sure you check the amount on the "Confirm" button before you click it. If the amount doesn't update after you put the head in the inventory, just be patient. She's in alpha.

Version 2.1a Changes:

• Fixed a bug where clicking on any sign will show it as a HeadHunter sign.
• Fixing a bug that throws an error in console when using the '/sellhead' command.
• Reverting the configuration options back to the previous version (for more control).

Version 2.1 Changes:

• Added a conversion tool for the PlayerHeads plugin.
• Improved sign formatting options.
• Added a whitelist for opped players who want to drop heads while opped.
• Added commands for easily editing the head-dropping whitelist.
• Improved configuration operations.
• Removed unused code.

Known Problems:

• The PlayerHeads conversion can be a bit clunky. Overall, it works properly, however multiple inventories plugins can cause some issues. Please PM me if you find any.
• Conversion does not convert mob heads. Only players' heads are converted.

Version 2.0 Changes:

• Too many to list. Read instructions for installation details!

Version 1.7c Changes:

• Players can no longer drop their head when they kill themselves.
• Fixed random selling error.

Version 1.7b Changes:

• Reviewed what causes heads to drop.
• Made heads keep the lore when placed and broken again.
• Added option to ignore world limitations.
• Added option to place both types of values on the head.
• Added support for Spigot 1.8.8.

Version 1.7 Changes:

• Drastically changed command structure.
• Added Javadocs.

Version 1.6d Changes:

• Added an option to display a number of the highest bounties with "/bounty list".
• Added notification options for selling heads and setting bounties.
• Removed unused code.
• Added extensive permissions to "/bounty list" command.

Version 1.6c Fixes:

• Fixed a bug that did not use colors when displaying the bounty list.

Version 1.6c Changes:

• Players can no longer sell their own heads.
• Added permission 'hunter.nodrop' for protection from head-stealing.
• Improved value retrieving system.
• Created "/hunter bounty list" command to list all players with bounties.
• Improved plugin structure.
• Sell notifications are no longer sent to the whole server.

Version 1.6b Changes:

• Fixed a bug where players would make a large amount of money killing themselves.
• Fixed a bug where it would say the user didn't have permission if they entered the bounty command incorrectly.
  
• Added /sellhead command.
• Added /bounty command.

Version 1.6a Changes:

• Added a separate permission for creating signs.
• Fixed a bug where stack is removed for the price of one head.
• Created "Hoarder Mode", where economy features are disabled.
• Option 'sell-notify' now broadcasts a server message instead of a private message.
• Added multiple Factions plugin support.

Version 1.6 Changes:

• Added Factions plugin support
• Added Minigames plugin support (least difficult)
• Added bounty system (most difficult)
• Complete command structure overhaul
• Complete permission structure overhaul

Version 1.5 Changes:

• Added multiple world support
• Added /addhunterworld and /removehunterworld commands
• Reviewed multiple economy support
• Made Vault mandatory

Version 1.4a Changes:

• Made HeadHunter compatible with Java 7
• Fixed number rounding bug when taking money from the victim

Version 1.4 Changes:

• Added formatting options for value tag and sell message
• Added a /sellhead command
• Minor formatting fixes
• Minor command fixes

Version 1.3b Changes:

• Included 'hunter.sell' permission in 'hunter.admin'.
• Removed /testskull command.

Version 1.3a Changes:

• Changed node in config.yml 'use-permissons' to 'use-permissions'.
• I am so sorry.

Version 1.3 Changes:

• The value of the head is now taken from the victim's balance.
• The /hhreload command was removed. Please use a server reload if needed.
• The value tag has been changed from the full balance to the sell price.
• Minor formatting to the value tag.
• Minor improvements in value parsing.