title: How to create a seaborn.heatmap() with frames around the tiles?
body: <p>I rendered a heatmap with seaborn.heatmap() works nicely. However, for a certain purpose I need frames around the plot. </p>
  
  <p><code>matplotlib.rcParams['axes.edgecolor'] = 'black'</code><br>
  <code>matplotlib.rcParams['axes.linewidth'] = 1</code></p>
  
  <p>both don't work.</p>