Add section ref to top of playhouse doc.

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coleifer · Dec 4, 2019 · a7541ba · a7541ba
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diff --git a/docs/peewee/playhouse.rst b/docs/peewee/playhouse.rst
@@ -19,6 +19,7 @@ make up the ``playhouse``.
 * :ref:`apsw`
 * :ref:`sqlcipher_ext`
 * :ref:`postgres_ext`
+* :ref:`crdb`
 * :ref:`mysql_ext`
 
 **High-level features**