title: Is it possible to use more than 2 colors in the color_tile function?
body: <p>I have a dataframe column that I'm currently formatting using the <code>formattable::color_tile</code> function (below):</p>
  
  <p><code>color_tile( "red", "springgreen" )</code></p>
  
  <p>My issue with this is that the values near the middle are an ugly brown color, and I'd ideally like it to be a red-amber-green gradient, but color_tile seems to only be able to take min.color and max.color parameters - is it possible to use a 3rd color with either this or similar formatting functions in R?</p>