Add changelog entry for test suite

Change-Id: Ibb1aba8f714bc167068a58069426591b5361bf3a

diff --git a/docs/build/unreleased/855.rst b/docs/build/unreleased/855.rst
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+.. change::
+    :tags: feature, tests
+    :tickets: 855
+
+    Created a "test suite" similar to the one for SQLAlchemy, allowing
+    developers of third-party dialects to test their code against a set of
+    Alembic tests that have been specially selected to exercise
+    back-end database operations. At the time of release,
+    third-party dialects that have adopted the Alembic test suite to verify
+    compatibility include
+    `CockroachDB
+        <https://pypi.org/project/sqlalchemy-cockroachdb/>`_ and
+    `SAP ASE (Sybase)
+        <https://pypi.org/project/sqlalchemy-sybase/>`_.