- Update to 4.0.0
  + Updated
    * Updated Plotly.js to version 1.48.3.
  + Added
    * The Plotly Express tech preview has been integrated as the `plotly.express` module 
    * Added a new renderers framework the supports rendering figure in a wide variety of contexts. See the new Displaying Plotly Figures documentation page for more information.
    * Added `plotly.io.write_html` and `plotly.io.to_html` functions for exporting figures to HTML. Also available as `.write_html` and `.to_html` figure methods.
    * Added new figure methods for batch updating figure properties (`update_layout`, `update_traces`, `update_xaxes`, etc.).  See the new Creating and Updating Figures documentation page for more details.
    * Added support for all trace types in `make_subplots` 
    * Added support for secondary y-axes in `make_subplots` 
    * Support passing a scalar trace object (rather than a list or tuple of trace objects) as the `data` property to the `Figure` constructor 
    * Added dictionary-stule `.pop` method to graph object classes 
    * New `jupyterlab-plotly` JupyterLab extension for rendering figures in JupyterLab. Replaces the `@jupyterlab/plotly-extension` extension, and includes JupyterLab 1.0 support.
    * Added new suite of built-in colorscales to the `plotly.colors` module, and support for specifying this wide range of colorscales by name. Also added support for specifying colorscales as a list of colors, in which case the color spacing is assumed to be uniform.
    * Added `sphinx-gallery` renderer for embedding plotly figures in Sphinx-Gallery.
  + Removed
    * The follow modules for interfacing with the Chart Studio cloud service have been removed from plotly.py and moved to the new `chart-studio` distribution package.  The following modules have been moved to a new top-level `chart_studio` module:
      > `plotly.plotly` -> `chart_studio.plotly`
      > `plotly.api` -> `chart_studio.api`
      > `plotly.dashboard_objs` -> `chart_studio.dashboard_objs`
      > `plotly.grid_objs` -> `chart_studio.grid_objs`
      > `plotly.presentation_objs` -> `chart_studio.presentation_objs`
    * The legacy `plotly.widgets.GraphWidget` class for displaying online figures hosted by Chart Studio as ipywidgets has been removed. Please use the offline, and much more capable, `plotly.graph_objects.FigureWidget` class instead.
    * The `fileopt` argument to `chart_studio.plotly.plot` has been removed, so in-place modifications to previously published figures are no longer supported, and a figure will always overwrite a figure with the same name. 
  + Changed
    * The `'plotly'` template is used as the default theme across all figures.
    * In order to reduce the size of the core `plotly` distribution package, the bundled geographic shape files used by the `create_choropleth` figure factory have been moved to a new optional `plotly-geo` distribution package 
    * For consistency with other figure factories, the `create_choropleth`  and `create_gantt` figure factories now always returns `Figure` objects, rather than dictionaries.
    * Figure add trace methods (`.add_trace`, `.add_traces`, `.add_scatter`, etc.) now return a reference to the calling figure, rather than the newly created trace 
    * `plotly.tools.make_subplots` has been moved to `plotly.subplots.make_subplots`, though it is still available at the previous location for backward compatibility
    * The `plotly.graph_objs` module has been moved to `plotly.graph_objects`, though it is still available at the previous location for backward compatibility 
    * Trace `uid` properties are only generated automatically when a trace is added to a `FigureWidget`.  When a trace is added to a standard `Figure` graph object the input `uid`, if provided, is accepted as is.
    * `datetime` objects that include timezones are not longer converted to UTC 
    * When a tuple property (e.g. `layout.annotations`) is updated with a list/tuple that is longer than the current value, the extra elements are appended to the end of the tuple.
  + Fixed
    * Fixed visibility of `bar` trace error bars in built-in templates 

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