Plotly

Added
- Modularize the library (first iteration). Trace types can be required in
one-by-one to make custom plotly.js bundles of lesser size. [180, 187, 193, 202]

Changed
- Remove json assets from the js source files (to better support Webpack bundling) [183]
- Update d3, tinycolor2, topojson dependencies [195]
- Improve `'colorscale'` attribute description [186]

Fixed
- Fix pan mode drag delay [188]
- Make `Plotly.deleteTrace` handle big-indices-array properly [203]

Fixed
- Click events work properly after being broken in 1.4.0 [174]

Added
- Lasso and rectangular selection interactions for scatter-marker and scatter-text traces [154, 169]
- Un-gitignore css and svg font built files, removing post-install step and
dependency on node-sass [164]

Changed
- Clean up Pie, Box and Choropleth trace module [158, 159, 165]

Fixed
- Surface traces correctly handle `zmin` and `zmax` attributes [153]
- Pie trace correctly trigger hover events [150]

Fixed

- Fix sandbox problem in the conda package for Linux [301]

Added

- Implement HTTP content-negotiation for plotly-graph [228]

Changed

- Bump electron from `1.8.4` to `6.1.4`

Fixed

- Fix colorbar in EMF exports [220]
- Fix `pageSize` attribute for Dash app preview [245, 250, 254]
- Fix EPS export to preserve graphics in vector format [266]
- Segmentation fault when NODE_OPTIONS environment variable set [266]

Fixed

- Fix `scattermapbox` image generation when mapbox access token is set
in the `layout.mapbox` container in plotly-graph component [195]