By Matt Audilet NFL Network insider Ian Rapoport was the first to break today’s Chicago Bears head coaching news. And thanks to a radio appearance he made earlier this morning, we have audio evidence of when he received the breaking information. While discussing a possible change to the NFL’s overtime rules on WEEI’s Gresh and Keefe, Rapoport was audibly shocked by a bit of news that popped up on his phone. Before abruptly hanging up on the show, the NFL insider gave a hilarious parting soundbite. “Oh, s***! I just got a text. I gotta go!” he said. Hosts Andy Gresh and Rich Keefe burst out lau…