Add #12170 fix to changelog

diff --git a/doc/build/changelog/unreleased_20/12170.rst b/doc/build/changelog/unreleased_20/12170.rst
new file mode 100644 (file)
index 0000000..452181e
--- /dev/null
+++ b/doc/build/changelog/unreleased_20/12170.rst
@@ -0,0 +1,7 @@
+.. change::
+    :tags: bug, postgresql
+    :tickets: 12170
+
+    Fixed issue where creating a table with a primary column of
+    :class:`_sql.SmallInteger` and using the asyncpg driver would result in
+    the type being compiled to ``SERIAL`` rather than ``SMALLSERIAL``.