This update is only to support 1.14.1. This is only a code-update as some inventory related methods have been removed.
Oh, and as I've had a surprise with a lot of my plugins, you should take a look over the new item names:
https://hub.spigotmc.org/javadocs/bukkit/org/bukkit/Material.html
The plugin should be backward compatible with all the versions that were compatible until this update,
if not, please tell me.
If you have any suggestions or any problems don't hesitate to reach out.