old_contents: from sklearn.ensemble import RandomForestClassifier
  from sklearn.datasets import load_digits as load_data
  import matplotlib.pyplot as plt
  from scikitplot.scikitplot import classifier_factory
  
  X, y = load_data(return_X_y=True)
  rf = classifier_factory(RandomForestClassifier())
  rf.plot_confusion_matrix(X, y, normalize=True)
  plt.show()
  
new_contents: """An example showing the plot_confusion_matrix method used by a scikit-learn classifier"""
  from sklearn.ensemble import RandomForestClassifier
  from sklearn.datasets import load_digits as load_data
  import matplotlib.pyplot as plt
  from scikitplot.scikitplot import classifier_factory
  
  X, y = load_data(return_X_y=True)
  rf = classifier_factory(RandomForestClassifier())
  rf.plot_confusion_matrix(X, y, normalize=True)
  plt.show()
  
subject: add docstring to plot_confusion_matrix example