Didn't have a chance to, unfortunately. I sent an email to the mailing list but it never got through. I created a wiki entry though: osm.wiki/Automated_edits/BenPortner Unfortunately I don't know Polish. What's written in the discussion?

source code here: https://github.com/BenPortner/osm_powiats_add_tags

source code here: https://github.com/BenPortner/osm_powiats_add_tags

sourcecode here: https://github.com/BenPortner/osm_powiats_add_tags