Version bump to 3.9.0
Version bump to 3.9.0

kevinansfield/Ghost,JohnONolan/Ghost,ErisDS/Ghost,bitjson/Ghost,e10/Ghost,kevinansfield/Ghost,JohnONolan/Ghost,JohnONolan/Ghost,janvt/Ghost,TryGhost/Ghost,TryGhost/Ghost,ErisDS/Ghost,ErisDS/Ghost,e10/Ghost,TryGhost/Ghost,kevinansfield/Ghost,janvt/Ghost,bitjson/Ghost