• Great update for the Spigot version of the plugin as well as performance improvements and bugfixes in both versions!
• If you have ProtocolLib installed, you can set a custom server icon while maintenance is enabled, also the playercount-message and the playercount-hover-message are now available (as it has already been in the Bungee version)!
• The Spigot version should be much more compatible with other motd-changing plugins, such as SexyMotd!
• In the BungeeCord version of the plugin, the "/maintenance remove <player>" command now also works for offline players
• Fixed some other issues with the ProtocolLib integration
• Removed the plugin's prefix from some messages
• Minor textfix for the updatemessage in the Spigot version
• General performance improvements

If you were already using an older version of the Spigot version of the plugin, you have to delete your old config, so it'll create a new one.