message: Add type hints to elu_test.py
diff: @@ -5,7 +5,7 @@ from onnx import defs, checker, helper
  class TestRelu(unittest.TestCase):
  - def test_elu(self):
  + def test_elu(self): # type: () -> None
  self.assertTrue(defs.has('Elu'))
  node_def = helper.make_node(
  'Elu', ['X'], ['Y'], alpha=1.0)
  