Add changelog entry

diff --git a/doc/build/changelog/unreleased_14/mypy_typedec.rst b/doc/build/changelog/unreleased_14/mypy_typedec.rst
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+.. change::
+    :tags: bug, mypy
+
+    Fixed issue in Mypy plugin where the plugin wasn’t inferring the correct 
+    type for columns of subclasses that don’t directly descend from 
+    ``TypeEngine``, in particular that of  ``TypeDecorator`` and 
+    ``UserDefinedType``.