You can use the pitch f/x tool at Brooks Baseball to look at data about any pitcher's appearance on a given date. Just navigate to the day of the game you're interested in, choose the game (Minnesota Twins vs. Milwaukee Brewers, for example), and select the pitcher. It'll give you a ton of information and graphs, but you'd probably be most interested in the tables that break down the pitch types. Here's the data from Yo's start today. As for your changeup question, it doesn't appear that he's throwing more of them, at least not today -- he only threw 4 according to pitch f/x, but it's important to remember that the pitch type data isn't always accurate (the data comes from GameDay, and sometimes they make some interesting decisions on pitch types).