This release contains a few new features:

• Introduces new classes for policy learning (see DRPolicyTree and DRPolicyForest in our documentation) (#377)
• Exposes the entire set of nuisance models and scores from training when using multiple monte carlo iterations for ortho-learner subclasses (previously only the final ones were kept) (#433)

It also fixes an interoperability issue with DoWhy (#434). Note that this change also removes the deprecated n_splits argument to our estimators, which had already been renamed to cv for the past several releases.