It was party time at Parkhead as Celtic sealed their seventh Scottish Premiership title in a row in a barnstorming Old Firm Derby. Odsonne Édouard took his Old Firm tally to three from two appearances since joining Celtic on loan from Paris Saint-Germain, after having scored the winner at Ibrox last month. Just before half-time, James Forrest weaved his way through the Rangers defence before Callu…