Fixing lint errors. Fixes Issue 244.

Reviewed in https://codereview.appspot.com/7516043/
diff --git a/tests/test_errors.py b/tests/test_errors.py
index 57e82e7..bd6c6d5 100644
--- a/tests/test_errors.py
+++ b/tests/test_errors.py
@@ -94,6 +94,6 @@
 
   def test_missing_reason(self):
     """Test an empty dict with a missing resp.reason."""
-    resp, content = fake_response('}NOT OK', {'status':'400'}, reason=None)
+    resp, content = fake_response('}NOT OK', {'status': '400'}, reason=None)
     error = HttpError(resp, content)
     self.assertEqual(str(error), '<HttpError 400 "">')