This plugin now uses a config.yml instead of .txt files for configuration.
Config.yml now gets created if there isn't one.
If save files from pre v1.9 are discovered, they will be loaded in and then saved in the new format. This means values you've changed before should transfer over.
If there is a version mismatch, the config.yml will be saved as config.yml.old and a new config.yml with default values will be created.