Improve default lag length for ACF

[mitchelloharawild]

Showing one seasonal period for sub-daily data doesn't provide enough information to be useful.

library(feasts)
#> Loading required package: fabletools
tsibbledata::vic_elec %>% ACF() %>% autoplot()
#> Response variable not specified, automatically selected `var = Demand`

^{Created on 2020-03-20 by the reprex package (v0.3.0)}