title: Set Max value for color bar on seaborn heatmap
body: <p>I need to set the max value on the seaborn heatmap <code>cbar</code> to 2. I've tried:</p>
  
  <pre><code>cbar_kws = { 'ticks' : [0, 2] }
  sns.heatmap(tiles, robust=True, fmt="f", cmap= 'RdBu_r', cbar_kws = cbar_kws)
  </code></pre>
  
  <p>But this doesn't work and the documentation isn't very clear. How would I do this properly?</p>