“We’re excited that we’re starting to represent our actual history,” Joe Pokaski tells TheWrap. With the news that Harriet Tubman will replace Andrew Jackson on the $20 bill, the cast and creators of WGN America’s Underground Railroad series “Underground” could not be happier. “We’ve always said the show ‘Underground’ is about American heroes, so to finally have not only a woman but a black woman on a monetary bill is fantastic,” co-creator Misha Green told TheWrap. “We use money all the time. We’re used to seeing these faces of these white males and now we’re excited that we’re starting to represent our actual history,” co-creator Joe Pokaski added. 👏🏾👏🏾👏🏾 from now…