The file 'serverlist.txt' was moved to 'lines.txt'. Simply move your contents of the old file to the new file to get it working correctly, or rename the file before updating.
Known bugs:
Client will show the server as outdated if you use an line with only spaces in your configuration file.
Changelog:
Completely rewritten API and plugins
Plugin is now licensed under the GPLv3
Added an 'about' command
Added a default configuration
Added a plugin configuration for disabling the player tracking and customizing the default player name (if the IP is unknown) -> serverlistplus.cfg
Version is now release 2.0 instead of a snapshot version
You can add comments in the configurations by using '#'
Command handling moved to the API instead of in the plugins