Add async as template (#858)

It seems that latest version of alembic lists `async` as template

diff --git a/docs/build/tutorial.rst b/docs/build/tutorial.rst
index 2ef84193c1a80e49e5e91a6cda70012b084a052b..84771ad2740a18e3d7aa7f377a978603c671e81d 100644 (file)
--- a/docs/build/tutorial.rst
+++ b/docs/build/tutorial.rst
@@ -106,6 +106,7 @@ command::
     Available templates:
 
     generic - Generic single-database configuration.
+    async - Generic single-database configuration with an async dbapi.
     multidb - Rudimentary multi-database configuration.
     pylons - Configuration that reads from a Pylons project environment.