Mr Papa said
what version is yours?  its listed in sp-google-sitemap-plugin.php file

latest is 2.3.5… looks pretty much like same date?  it has the changes (at least locally).. will check the downloads…   

It’s 2.3.5 so that api update must have been overlooked.

yeah, sorry checked the download and it seems wrong too.. not sure how, but it is..  just havent had time today to update yet…

new update available… wouldnt trust your version with just those changes… need to make sure you get them all…

As the old saying goes, crap happens. I wouldn’t have known if Google didn’t post a notification in my webmaster tools dashboard. 

Sitemap looks OK but I will update it tomorrow to be sure. Thanks again for all your help. 

know all about that! 😉