title: Dynamically adjust y-min/max after range-selector in Dygraph
body: <p>When the range selector is used to shrink/expand the viewing x-range, the y axis remains unchanged. Is there a way to update these values based on the current min/max?</p>
  
  <p>I know there is a way to update the settings, the problem is I don't know how to capture the current min/max on the range selector. What I have set up is a function that gets called on the draw() callback so the only thing I'm missing is how to calculate the current range min/max values.</p>