Add draft changelog

diff --git a/doc/build/changelog/unreleased_20/8765.rst b/doc/build/changelog/unreleased_20/8765.rst
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+.. change::
+    :tags: usecase, postgresql
+    :tickets: 8765
+
+    Complementing :ticket:`8690`, new comparison methods such as
+    ``adjacent_to()``, ``difference()``, ``union()``, etc., were added to the
+    PG-specific range objects, bringing them in par with the standard
+    operators implemented by the underlying
+    :attr:`_postgresql.AbstractRange.comparator_factory`. Pull request
+    courtesy Lele Gaifax.