sw_tidy() is a wrapper for broom::tidy(). The main benefit of sw_tidy()
is that it has methods for various time-series model classes such as
HoltWinters, ets, Arima, etc.
sw_tidy() methods always returns a "tidy" tibble with model coefficient / parameters.
For non-time series, sw_tidy() defaults to broom::tidy().
The only difference is that the return is a tibble.
The output of sw_tidy() is always a tibble with disposable row names. It is
therefore suited for further manipulation by packages like dplyr and
ggplot2.