Plotly

Fixed
- Fix hover events in Shadow DOM [[6021](https://github.com/plotly/plotly.js/pull/6021)],
with thanks to SabineWren for the contribution!

Fixed
- Fix loading issue in [orca](https://github.com/plotly/orca) (regression introduced in 2.6.0) [[#6011](https://github.com/plotly/plotly.js/pull/6011)]

Fixed
- Fix to avoid including local stackgl_modules/node_modules in the package (regression introduced in 2.6.0) [[6008](https://github.com/plotly/plotly.js/pull/6008)]

Updated
- Updated `plotly.min.js` to version 1.37.1.
- New features include a `splom` (scatter plot matrix) trace type.
- See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md#1371----2018-05-02) for additional information regarding the updates.
- Error message for `plotly.figure_factory.create_choropleth` is more helpful for Windows users on installing `geopandas` and dependencies including `shapely`.

Fixed
- `plotly.figure_factory.create_choropleth` now works in Windows without raising an OSError. The module now uses cross-platform path tools from `os` to manipulate and manage the shapefiles contained in this package.

Fixed
- `import plotly.figure_factory` does not fail if `pandas` is not installed. See https://github.com/plotly/plotly.py/pull/958
Added
- New parameter `fill_percent` to the `.insert` method for the dashboards API. You can now insert a box into the dashboard layout and specify what proportion of the original container box it will occupy. Run `help(plotly.dashboard_objs.Dashboard.insert)` for more information on `fill_percent`.
Updated
- Updated `plotly.min.js` to version 1.35.2.
- New features include adding an `automargin` attribute to cartesian axes and a layout `grids` attribute for easy subplot generation.
- See [the plotly.js CHANGELOG](https://github.com/plotly/plotly.js/blob/master/CHANGELOG.md#1352----2018-03-09) for additional information regarding the updates.
- `plotly.figure_factory.create_choropleth` has changed some of the default plotting options:
- 'offline_mode' param has been removed from call signature.
- Persistent selection api for the centroid points is automatically enabled. See https://plot.ly/python/reference/#scatter-selected and https://plot.ly/python/reference/#scatter-unselected for details
- FIPS values that appear on hover are 0-padded to ensure they are 5 digits.
- `hover_info='none'` is now default for the county lines data.