Update rstanarm function for prediction

[juliasilge]

In this line, the rstanarm function needs to change to rstanarm::posterior_epred()

parsnip/R/linear_reg_data.R

Line 261 in 53722db

func = c(pkg = "rstanarm", fun = "posterior_linpred"),

The warning that is being generated and shown to users at prediction time is:

Instead of posterior_linpred(..., transform=TRUE) please call posterior_epred(), which provides equivalent functionality.

This also needs to change for logistic_reg().

Related to tidymodels/tidymodels.org#200 and tidymodels/TMwR#43

[topepo]

closed by #390

[github-actions]

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