cvms 1.6.0

plot_confusion_matrix():

• Breaking: Adds slight 3D tile effect to help separate tiles with the same count.
  Not tested in all many-class scenarios.

• Fixes image sizing (arrows and zero-shading) when there are different
  numbers of unique classes in targets and predictions.

• Fixes bug with class_order argument when there are different
  numbers of unique classes in targets and predictions.