CRAN v0.3.1

New features

• Added outliers() generic for identifying the outliers of a fitted model.
• Added special_xreg() special generator, for producing a model matrix of
  exogenous regressors. It supports an argument for controlling the default
  inclusion of an intercept.
• Migrated common_xregs helper from fable to fabletools for providing a
  common and consistent interface for common time series exogenous regressors.
• Added experimental support for passing the tsibble index to features()
  functions if the .index argument is used in the function.

Improvements

• Added transformation support for fallback fitted(h > 1) method (#302).
• Documentation improvements.