Update plotly to 3.0.0

[pyup-bot]

This PR updates plotly from 2.7.0 to 3.0.0.

Changelog

3.0.0

This is a major version with many exciting updates. See the [Introducing plotly.py 3.0.0](https://medium.com/plotlygraphs/introducing-plotly-py-3-0-0-7bb1333f69c6) post for more information.

Added
- Full Jupyter ipywidgets integration with the new `graph_objs.FigureWidget` class
- `FigureWidget` figures can be updated interactively using property assignment syntax
- The full trace and layout API is generated from the plotly schema to provide a great experience for interactive use in the notebook
- Support for setting array properties as numpy arrays. When numpy arrays are used, ipywidgets binary serialization protocol is used to avoid converting these to JSON strings.
- Context manager API for animation. Run `help(go.Figure().batch_animate)` for the full doc string.
- Perform automatic retries when communicating with plot.ly services. This introduces a new required dependency on the [retrying](https://pypi.org/project/retrying/) library.
- Improved data validation covering the full API with clear, informative error messages. This means that incorrect properties and/or values now always raise a `ValueError` with a description of the error, the invalid property, and the available properties on the level that it was placed in the graph object. Eg. `go.Scatter(foo=123)` raises a validation error. See https://plot.ly/python/reference/ for a reference to all valid properties and values in the Python API.
- Error message for `plotly.figure_factory.create_choropleth` is now helpful to Anaconda users who do not have the correct modules installed for the County Choropleth figure factory.

Changed / Deprecated
Please see the [migration guid](migration-guide.md) for a full list of the changes and deprecations in version 3.0.0

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 197

• 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 59.058%

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Totals
Change from base Build 194:	0.0%
Covered Lines:	4238
Relevant Lines:	7176

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💛 - Coveralls