By Alek Arend LSU star gymnast Olivia Dunne is having some summer fun before school gets back in session. Dunne is one of the most-followed college athletes of any sport. All summer long, she’s been updating her followers with her vacation photos. Dunne, who just recently reached two million followers on Instagram, took a trip out to Yankee Stadium this week. She even donned a Yankees hat at the game. Looks like fun. This isn’t the only big trip Olivia Dunne has taken this summer. Thanks to her massive social-media following, Dunne has landed some major endorsement deals through the Name, Imag…