Rangers have confirmed the signing of Hearts midfielder Cammy Devlin.Rangers have announced the signing of Australian international midfielder Cammy Devlin on a free transfer following confirmation of his departure from Hearts on Friday.Devlin, 28, has penned a two-year contract at Ibrox, with the option of a further year, and becomes the club’s sixth arrival of the summer transfer window, following the capture of former Hearts captain Lawrence Shankland, Ross McCrorie, Dan Neil, Ben Godfrey and Ivor Pandur.A key figure in Derek McInnes’ Hearts side that finished second and took the Scottish Premiership title race to the final day last season, Devlin had been with the Tynecastle outfit for five seasons and had been offered improved terms to extend his stay with the club.Devlin has signed a two-year contract with Rangers following his exit from Hearts…