added changelog file

diff --git a/doc/build/changelog/unreleased_20/12444.rst b/doc/build/changelog/unreleased_20/12444.rst
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+.. change::
+    :tags: sql
+    :tickets: 12444
+    
+    Implemented support for the GROUPS frame specification in window 
+    functions by adding "groups" option to :class:`.Over` and 
+    :meth:`.FunctionElement.over`. Pull request courtesy Kaan Dikmen.