Fixed linting error
Fixed linting error

refs https://github.com/TryGhost/Ghost/commit/256b407dd2d4f48a41f31922115c5b1fc4666ccb

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