Note: I have updated the plugin to be in api version 1.13. This means that old item names will not work if you are running spigot 1.13 and above. Anyone running versions below 1.13 DO NOT delete your Items.yml file as the default one would not work for lower versions.

Fixed: Cooldown not working properly. (Reported by @Gethelp )
Fixed: Cooldown not being started properly.
Fixed: Cooldown being overridden by "still doing captcha" state.
Fixed: Players not being taken out of "still doing captcha" state after they have completed the captcha.
Added: Code to tell you which item is causing the errors when making the captchas GUI.
Changed: Item names in the Items.yml file. If you are using spigot version 1.13 or above, please use the code that tells you the errors to find the wrong item names, or simply let the plugin generate the update set of item names for you by deleting Items.yml. Servers running 1.12 and below can keep their old files.