title: Bootstrap v4 beta scrollspy triggering too late
body: <p>I'm trying to create a demo of Bootstrap 4 beta <code>scrollspy.js</code> with minimal styling. The navigation scrolls to the correct location, though it seems like the position where the navigation active state updates is too low. The trigger point seems right below the titles instead of right above.</p>
  
  <p>Have I overlooked something in the implementation? <a href="https://codepen.io/DannyJoris/pen/ZJwdbv" rel="nofollow noreferrer">https://codepen.io/DannyJoris/pen/ZJwdbv</a></p>