No breaking changes besides one small API change.

New features

• Support for 1.18 and 1.18.1
• Tab completion for all /ssx subocmmands
• Added /ssx openmenu <menu> <player> command

Fixed

• NPE when opening a menu with an invalid config file
• Error 500 in /ssxc status
• The hide-flags option now works again
• Placeholders or server names with non-ascii utf-8 characters now work again

Other changes

• Removed the need for the commons-lang3 dependency, reducing jar size by 0.2MB
• Return types for API methods getServer and getOnlineServers have changed
• Updated head database API from 1.3.0 to 1.3.1
• Updated PlaceholderAPI from 2.10.10 to 2.11.0
• Updated NBT API from 2.8.0 to 2.9.0