Format basewidget.py

Author: jescalada

plotly/basewidget.py

@@ -143,7 +143,7 @@ def __init__(
         self._view_count = 0
 
         # Initialize widget layout and data for third-party widget integration
-        # -------------------------------------------------------------------- 
+        # --------------------------------------------------------------------
         self._widget_layout = deepcopy(self._layout_obj._props)
         self._widget_data = deepcopy(self._data)