update directory of bundle for tests since protected

Author: chriddyp

plotly/tests/test_optional/test_offline/test_offline.py

@@ -15,7 +15,7 @@ class PlotlyOfflineTestCase(TestCase):
     @raises(PlotlyOfflineNotFound)
     def test_initializing_before_downloading_raises_an_error(self):
         try:
-            os.remove(plotly.offline.PLOTLY_OFFLINE_BUNDLE)
+            os.remove(plotly.offline.offline.PLOTLY_OFFLINE_BUNDLE)
         except OSError:
             pass