This is just a small update to fix a few bugs shipped with the 13.6.0 update.
Your spigot server should update automatically, if you haven't disabled that option.
For some users, the permissions weren't correctly working. That was a bug from ACF which got fixed and included in this build.
Added a new config option: "UseOldSkinHelp: true" to use the "old" /skin help page. You can edit it in messages.yml, "HELP_PLAYER". Please note: You'll loose all the cool features from ACF like dynamic help messages when activating this option.
Re-added the alias command /skinsrestorer for /sr.
/skins (GUI) is now working again. Please note: As of this spigot update, this feature is only working on 1.13 and above.