There was released the latest version of the plugin today – it’s version 2.5.0.
It removes all deprecated filters and old methods for custom multi-lingual plugins support. Additionally, there is new option for removing duplicates from the sitemap and many things has been optimized.
Full change log can be find here: //kocujsitemap.wpplugin.kocuj.pl/change-log/version-2-5-0.