Hotfixes tests failing from URL object change

aiohttp decided to use yarl for their new URL objects so that they
aren't plain strings anymore which means that this single test fails.
Not a huge change but this should fix the testing suite.

tests/test_redirect.py

@@ -88,4 +88,4 @@ def test_chained_redirect(redirect_app):
     assert request.url.endswith('/1')
     assert response.status == 200
     assert response.text == 'OK'
-    assert response.url.endswith('/3')
+    assert response.url.path.endswith('/3')