restore psycopg changelog file

this file was removed from 1.4 as part of
3b6a68b.  as this is a 2.0 only change, restore it there.

Change-Id: Idd7081d9e09b4b725283b4a7965ee37fd169eac8
References: #6842

diff --git a/doc/build/changelog/unreleased_20/6842.rst b/doc/build/changelog/unreleased_20/6842.rst
new file mode 100644 (file)
index 0000000..927c4b8
--- /dev/null
+++ b/doc/build/changelog/unreleased_20/6842.rst
@@ -0,0 +1,16 @@
+.. change::
+    :tags: postgresql, dialect
+    :tickets: 6842
+
+    Added support for ``psycopg`` dialect supporting both sync and async
+    execution. This dialect is available under the ``postgresql+psycopg`` name
+    for both the :func:`_sa.create_engine` and
+    :func:`_asyncio.create_async_engine` engine-creation functions.
+
+    .. seealso::
+
+        :ref:`ticket_6842`
+
+        :ref:`postgresql_psycopg`
+
+