on windows, some test is now raising a fully fledged ClientOSError in…

…stead of an empty ServerDisconnectedError

tests/test_client_functional_oldstyle.py

@@ -710,7 +710,7 @@ async def go():
             await r.read()
             self.assertEqual(1, len(connector._conns))
 
-            with self.assertRaises(aiohttp.ServerDisconnectedError):
+            with self.assertRaises(aiohttp.ClientConnectionError):
                 await session.request('GET', url)
             self.assertEqual(0, len(connector._conns))