Update plotly to 3.1.1

[pyup-bot]

This PR updates plotly from 3.0.2 to 3.1.1.

Changelog

3.1.1

This release is a minor bug-fix update to version 3.1.0

JupyterLab Versions
For use with JupyterLab, the following versions of the following packages
must be installed:

- Python Packages
- plotly==3.1.1
- ipywidgets>=7.2
- notebook>=5.3
- jupyterlab==0.33

- JupyterLab Extensions
- plotlywidget0.2.1
- jupyter-widgets/jupyterlab-manager0.36
- jupyterlab/plotly-extension0.16

Updated
- Updated plotly.js to version 1.39.4.
- This is a bug-fix release of plotly.js
- See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md1394----2018-08-02) for more information

Fixed
- Fixed error in validation of configkeys
[plotly/plotly.js1065](https://github.com/plotly/plotly.py/pull/1065)
- Fixed error in presentation of named colorscales
[plotly/plotly.js1089](https://github.com/plotly/plotly.py/pull/1089)
- Fixed numerical precision error when using `plotly.tools.make_subplots`
to create figures with a large number of subplots
[plotly/plotly.js1091](https://github.com/plotly/plotly.py/pull/1091)
- Fixed problem that prevented the use of the `.update` method to initialize
an array property (e.g. `layout.shapes`)
[plotly/plotly.js1091](https://github.com/plotly/plotly.py/pull/1092)
- Fixed `FigureWidget` problem causing scroll zoom on 3D plots to stutter
[plotly/plotly.js1094](https://github.com/plotly/plotly.py/pull/1094) 
- Fixed invalid `tickmode` property in `matplotlylib`
[plotly/plotly.js1101](https://github.com/plotly/plotly.py/pull/1101)

3.1.0

JupyterLab Versions
For use with JupyterLab, the following versions of the following packages
must be installed. See [README.md](README.md) for instructions.

- Python Packages
- plotly==3.1.0
- ipywidgets>=7.2
- notebook>=5.3
- jupyterlab==0.32.1

- JupyterLab Extensions
- plotlywidget0.2.0
- jupyter-widgets/jupyterlab-manager0.35
- jupyterlab/plotly-extension0.16

Updated
- Updated Plotly.js to version 1.39.2
- See highlights below
- See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md1392----2018-07-16) for more information.

Added
- Added 3D streamtube traces
[plotly/plotly.js2658](https://github.com/plotly/plotly.js/pull/2658)
- Added support for on-graph text in scattergl traces
- Added gridshape attribute to polar subplots with values 'circular' (the default) and 'linear' (to draw polygon grids)
[plotly/plotly.js2739](https://github.com/plotly/plotly.js/pull/2739)

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 294

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.01%) to 60.997%

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Files with Coverage Reduction	New Missed Lines	%
pymaid/fetch.py	1	72.07%

Totals
Change from base Build 291:	-0.01%
Covered Lines:	4626
Relevant Lines:	7584

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💛 - Coveralls