Surrogate 3.3.2

Surrogate 3.3.0

• Added and updated functions for the survival-categorical, survival-binary, and
  survival-continuous settings in the meta-analytic framework.
• Added functions to perform the two-stage federated surrogacy evaluation.

Surrogate 3.3.1

• General implementation of the information-theoretic causal inference framework
  based on D-vine copula models for the ordinal-ordinal, ordinal-continuous, and
  continuous-continuous settings.

Surrogate 3.3.2

• Fix tests that fail on CRAN.