title: intro.js : {done,prev,next} buttons order change to [prev,next,done]?
body: <p>now: [done,prev,next]</p>
  
  <p>I want an order like [ prev,next,done ],but I have not found any Options to change the button order.
  <a href="http://introjs.com/docs/intro/options/#options" rel="nofollow noreferrer">http://introjs.com/docs/intro/options/#options</a></p>
  
  <p>there is an option about button: showButtons, but it is not about button orders.</p>