use .pred instead of .pred_survival at highest level (#589)

Author: topepo

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: parsnip
 Title: A Common API to Modeling and Analysis Functions
-Version: 0.1.7.9000
+Version: 0.1.7.9001
 Authors@R: 
     c(person(given = "Max",
              family = "Kuhn",

NEWS.md

@@ -10,6 +10,7 @@
 
 * Fixed a bug for `logistic_reg()` with the LiblineaR engine (#552).
 
+* The list column produced when creating survival probability predictions is now always called `.pred` (with `.pred_survival` being used inside of the list column). 
 
 # parsnip 0.1.7
 

R/predict.R

@@ -83,7 +83,8 @@
 #'
 #'  * `type = "time"` produces a column `.pred_time`.
 #'  * `type = "hazard"` results in a column `.pred_hazard`.
-#'  * `type = "survival"` results in a column `.pred_survival`.
+#'  * `type = "survival"` results in a list column containing tibbles with a
+#'     `.pred_survival` column.
 #'
 #'  For the last two types, the results are a nested tibble with an overall
 #'  column called `.pred` with sub-tibbles with the above format.
@@ -255,7 +256,7 @@ format_survival <- function(x) {
     x <- as_tibble(x, .name_repair = "minimal")
     names(x) <- ".pred"
   } else {
-    x <- tibble(.pred_survival = unname(x))
+    x <- tibble(.pred = unname(x))
   }
 
   x