Trying to make session embeddable

tests/test_hydrometer.py

@@ -9,8 +9,8 @@ from rapt.hydrometer import Hydrometer
 @pytest.fixture
 async def client(aiohttp_client):
     app = web.Application()
-    await aiohttp_client(app)
-    yield Client("test", "test")
+    session = await aiohttp_client(app)
+    yield Client("test", "test", None)
 
 async def test_get_hydrometers(client):
     with aioresponses() as responses: