You will have to delete your old config.yml, but i suggest to make a backup of it. Please note that this is a RC (Release candidate) and it could have some issues. To help me fixing them please report any problem to HyperSoftware discord
Added:
Fully customizable particles for each upgrade level while holding an upgraded weapon.
Update checker (make an advice if a newer version of the plugin is out)
"hide-item-attributes-on-upgrade" option inside config.yml, to hide attributes of your items after an upgrade.
Removed:
"legacy" and "latest" sections inside config.yml (now you will have a single setup section for particles: make sure that you are using the right particle types for your server version)