title: How do you change line-spacing on a SKLabelNode?
body: <p>How do you change the leading (line-spacing) on a multi-line SKLabelNode?</p>
  <p>Do users of SpriteKit simply have to accept whatever default Apple gives?</p>
  <p>I see no way in the APIs to change it. Given it must wrap lower-level APIs, I would think there may be a way to do it. But Googling avails me naught.</p>