parameters 0.20.2

General

• Reduce unnecessary warnings.

• The deprecated argument df_method in model_parameters()was removed.

• Output from model_parameters() for objects returned by manova() and
  car::Manova() is now more consistent.

Bug fix

• Fixed issues in tests for mmrm models.

• Fixed issue in bootstrap_model() for models of class glmmTMB with
  dispersion parameters.

• Fixed failing examples.