fabletools 0.3.3

Improvements

Fixed handling of transformed distributions which accept a parameter from the
dataset.
. in a model formula for xreg implemented with special_xreg() will now
include all measured variables (excluding the index and key variables).
Improved handling of transformations with forecast sample distributions.
Added support for reconciling sample paths.
accuracy(<fbl_ts>) can now summarise accuracy over key variables. This is
done by specifying the accuracy by argument and not including some (or all)
of the fable's key variables (#341).
Like forecast(), generate() will now keep exogenous regressors in the
output table.
Re-export generics::forecast() for better compatibility with registering
methods alongside other packages (#375).