I have friends who went to Southwest Missouri State University. Apparently, when it made the recent change to Missouri State, they were asked if they wanted a new diploma, but had to pay for it if so. I gather it wasn't exactly cheap, either!
My alma mater changed names immediately before my freshman year. Thus, I applied and was accepted to one school, but actually attended another.
As for the OP, I would just put the new name without reference to the old.