Add changes to whats new

docs/about/whats_new.rst

@@ -17,6 +17,8 @@ v1.8.4 (???)
 - Add support for 3D Datasets. (:pull:`1099`)
 - Add new "license" and "description" properties to `DatasetType` to enable easier access to product information. (:pull:`1143`, :pull:`1144`)
 - Add new ``dataset_predicate`` param to ``dc.load`` for more flexible temporal filtering (e.g. loading data for non-contiguous time ranges such as specific months or seasons over multiple years). (:pull:`1148`)
+- Fix to ``GroupBy`` to ensure output output axes are correctly labelled when sorting observations using ``sort_key`` (:pull:`1157`)
+- ``GroupBy`` is now its own class to allow easier custom grouping and sorting of data (:pull:`1157`)
 
 .. _`notebook examples`: https://github.com/GeoscienceAustralia/dea-notebooks/