tests/test_tutorial/test_middleware/test_tutorial001.py: fixing a typo

tests/test_tutorial/test_middleware/test_tutorial001.py

@@ -10,7 +10,6 @@ def test_add_process_time_header_middleware():
     assert response.json() == {"hello": "world"}
     assert "X-Process-Time" in response.headers
     assert len(response.headers["X-Process-Time"]) > 0
-
     # request/response process time
     process_time = response.headers["X-Process-Time"]
     assert float(process_time) > 0