add PR number

Author: topepo

NEWS.md

@@ -1,7 +1,7 @@
 # parsnip (development version)
 
 * A new model mode, "quantile regression" was added. Including:
-  * A function to create a new vector class called `quantile_pred()` was added. 
+  * A function to create a new vector class called `quantile_pred()` was added (#1191). 
   * A `linear_reg()` engine for `"quantreg"`. 
 
 * `fit_xy()` currently raises an error for `gen_additive_mod()` model specifications as the default engine (`"mgcv"`) specifies smoothing terms in model formulas. However, some engines specify smooths via additional arguments, in which case the restriction on `fit_xy()` is excessive. parsnip will now only raise an error when fitting a `gen_additive_mod()` with `fit_xy()` when using the `"mgcv"` engine (#775).