doc: updated changelog

Signed-off-by: Luka Peschke <luka.peschke@toucantoco.com>
ToucanToco · Oct 3, 2022 · 18d3d5b · 18d3d5b
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 ## Unreleased
 
+- PyPika: Fixed "split" step with Google Big Query backend: If provided, the delimiter is now passed wrapped in single quotes.
+  Also, empty strings are returned rather than null values, for consistency with other backends
+- PyPika: Fixed "split" step with Athena backend: empty strings are returned rather than null values, for consistency with other backends
+
+
 ## [0.25.2] - 2022-09-27
 
 - Fixed "matches" operator behaviour of the IfThenElse step in case the column the condition applies to contains NA values