Update README.rst

README.rst

@@ -71,7 +71,7 @@ Connection pooling ported from aiopg_ and rely on PEP492_ features:
         dsn = 'Driver=SQLite;Database=sqlite.db'
         pool = await aioodbc.create_pool(dsn=dsn, loop=loop)
 
-        async with (await pool) as conn:
+        async with pool.get() as conn:
             cur = await conn.cursor()
             await cur.execute("SELECT 42;")
             r = await cur.fetchall()