By Andrew Holleran Michigan football players reportedly received a telling text message from now-former offensive coordinator Josh Gattis on Sunday morning. Gattis, Michigan’s offensive coordinator, is leaving the Wolverines for the same position at the University of Miami. Sunday morning, Gattis reportedly explained his decision to leave in a text message to some Wolverines players. ESPN college football insider Tom VanHaaren shared the text. “Unfortunately the past few weeks has told a different story to me about the very little appreciation I have here from administration. In life I would n…