<br /> Lin-Manuel Miranda may have an Emmy, three Tonys, three Grammys and a Pulitzer Prize to his credit, but his new role in “Mary Poppins Returns” was challenging even him. <br /><br />The “Hamilton” composer and star dropped by “The Ellen DeGeneres Show” Tuesday to chat about the hotly anticipated Disney film, which is a sequel to the 1964 classic “Mary Poppins,” starring Julie Andrews and Dick Van Dyke. <br />
