added self.maxDiff=None

Author: Kully

plotly/tests/test_optional/test_figure_factory.py

@@ -1364,6 +1364,8 @@ def test_df_dataframe_all_args(self):
         self.assertEqual(test_gantt_chart['layout'],
                          exp_gantt_chart['layout'])
 
+        self.maxDiff = None
+
 
 class TestViolin(NumpyTestUtilsMixin, TestCase):