Update example_pool.py

examples/example_pool.py

@@ -9,7 +9,7 @@ async def test_pool():
     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()