def sizes
      @attrs.fetch(:sizes, []).each_with_object({}) do |(key, value), object|
        object[key] = Size.new(value)
      end
    end
def sizes
      @attrs.fetch(:sizes, []).each_with_object({}) do |(key, value), object|
        object[key] = Size.new(value)
      end
    end
Returns an array of photo sizes

 @return [Array<Twitter::Size>]