chore(package): update ember-sortable to version 1.9.0 (#369)
chore(package): update ember-sortable to version 1.9.0 (#369)

https://greenkeeper.io/
kevinansfield/Ghost-Admin,JohnONolan/Ghost-Admin,TryGhost/Ghost-Admin,acburdine/Ghost-Admin,JohnONolan/Ghost-Admin,kevinansfield/Ghost-Admin,TryGhost/Ghost-Admin,acburdine/Ghost-Admin