Add news entry for formula lhs parser len1 retention change

tidyverts · Sep 4, 2023 · 6f40180 · 6f40180
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 # fabletools (development version)
 
+## New features
+
+* The formula parser now identifies and stores length 1 values in the 
+  transformation environment. This simplifies common tasks like automatic
+  box-cox parameters for each series, which can now be done with
+  `fable::ARIMA(box_cox(y, feasts::guerrero(y)))`.
+
 ## Improvements
 
 * Added support for visualising different point forecasts (say means and medians)