Update plotly to 4.0.0

[pyup-bot]

This PR updates plotly from 3.9.0 to 4.0.0.

Changelog

4.0.0

This is a major release that includes many new features, and a few breaking changes. See the [version 4 announcement](https://community.plot.ly/t/introducing-plotly-py-4-0-0rc1/25639) for a summary of the important changes.

Updated
- Updated Plotly.js to version 1.48.3. See the
[plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md1483----2019-06-13)
for more information.

Added
- The Plotly Express tech preview (https://medium.com/plotlygraphs/introducing-plotly-express-808df010143d) has been integrated as the `plotly.express` module ([1613](https://github.com/plotly/plotly.py/pull/1613))
- Added a new renderers framework the supports rendering figure in a wide variety of contexts ([1474](https://github.com/plotly/plotly.py/pull/1474)). See the new [Displaying Plotly Figures](https://plot.ly/python/next/renderers) documentation page for more information.
- Added `plotly.io.write_html` and `plotly.io.to_html` functions for exporting figures to HTML ([1474](https://github.com/plotly/plotly.py/pull/1474)). 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.) ([1624](https://github.com/plotly/plotly.py/pull/1624)).  See the new [Creating and Updating Figures](https://plot.ly/python/next/creating-and-updating-figures/) documentation page for more details.
- Added support for all trace types in `make_subplots` ([1528](https://github.com/plotly/plotly.py/pull/1528))
- Added support for secondary y-axes in `make_subplots` ([1564](https://github.com/plotly/plotly.py/pull/1564))
- Support passing a scalar trace object (rather than a list or tuple of trace objects) as the `data` property to the `Figure` constructor ([1614](https://github.com/plotly/plotly.py/pull/1614))
- Added dictionary-stule `.pop` method to graph object classes ([1614](https://github.com/plotly/plotly.py/pull/1614))
- 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 ([1647](https://github.com/plotly/plotly.py/pull/1647)).
- Added `sphinx-gallery` renderer for embedding plotly figures in [Sphinx-Gallery](https://sphinx-gallery.github.io/) ([1577](https://github.com/plotly/plotly.py/pull/1577), [plotly/plotly-sphinx-gallery](https://github.com/plotly/plotly-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 ([1604](https://github.com/plotly/plotly.py/pull/1604))
- For consistency with other figure factories, the `create_choropleth`  and `create_gantt` figure factories now always returns `Figure` objects, rather than dictionaries ([1600](https://github.com/plotly/plotly.py/pull/1600), [1607](https://github.com/plotly/plotly.py/pull/1607)).
- 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 ([1624](https://github.com/plotly/plotly.py/pull/1624))
- `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 ([1614](https://github.com/plotly/plotly.py/pull/1614))
- 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 ([1580](https://github.com/plotly/plotly.py/pull/1580)).
- `datetime` objects that include timezones are not longer converted to UTC ([1581](https://github.com/plotly/plotly.py/pull/1581))
- 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 ([1656](https://github.com/plotly/plotly.py/pull/1656))

3.10.0

Updated
- Updated Plotly.js to version 1.48.1. See the
[plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md1481----2019-05-30)
for more information.

Added
- Added funnel trace
([plotly/plotly.js3817](https://github.com/plotly/plotly.js/pull/3817),
[plotly/plotly.js3911](https://github.com/plotly/plotly.js/pull/3911))
- Added funnelarea traces
([3876](https://github.com/plotly/plotly.js/pull/3876),
[3912](https://github.com/plotly/plotly.js/pull/3912))
- Added support for shared color axes via coloraxis attributes in the layout
([3803](https://github.com/plotly/plotly.js/pull/3803),
[3786](https://github.com/plotly/plotly.js/pull/3786),
[3901](https://github.com/plotly/plotly.js/pull/3901),
[3916](https://github.com/plotly/plotly.js/pull/3916))
- Added support for sorting categorical cartesian axes by value
([3864](https://github.com/plotly/plotly.js/pull/3864))
- Added `bingroup` to `histogram`, `histogram2d` and `histogram2dcontour`
to group traces to have compatible auto-bin values
([3845](https://github.com/plotly/plotly.js/pull/3845))
- Add legend `itemclick` and `itemdoubleclick` attributes to set or disable
the legend item click and double-click behavior
([3862](https://github.com/plotly/plotly.js/pull/3862))
- Added support for calling orca through [Xvfb](https://www.x.org/releases/X11R7.6/doc/man/man1/Xvfb.1.xhtml)
to support static image export on Linux when X11 is not available
([1523](https://github.com/plotly/plotly.py/pull/1523)).

Fixed
- Fixed `PlotlyJSONEncoder` encoding error when `simplejson` is installed
([1556](https://github.com/plotly/plotly.py/issues/1556),
[1561](https://github.com/plotly/plotly.py/pull/1561))
- HTML export now honors the figure height specified in the figure template
([1560](https://github.com/plotly/plotly.py/issues/1560))
- Fixed display height of figure displayed in JupyterLab
([1572](https://github.com/plotly/plotly.py/issues/1572),
[1571](https://github.com/plotly/plotly.py/pull/1571))
- Fixed honouring of the `validate=False` option for all renderer types
([1576](https://github.com/plotly/plotly.py/pull/1576))

Links

• PyPI: https://pypi.org/project/plotly
• Changelog: https://pyup.io/changelogs/plotly/
• Homepage: https://plot.ly/python/

[coveralls]

Pull Request Test Coverage Report for Build 813

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 51.537%

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Totals
Change from base Build 808:	0.0%
Covered Lines:	4929
Relevant Lines:	9564

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