Plotly

Added
- Add `updatemenus` (aka dropdowns) layout components [770]
- Trace type `scattermapbox` is now part of the main bundle [816]
- Add support for `plot` in child windows [764, 806]
- Horizontal legends with many items are now wrapped into multiple lines [786]
- Active color of range selector button is now configurable via `activecolor`
[796]
- Add support for mapbox style JSON [795]

Changed
- Promise queue is cleared on `restyle` and `relayout` instead of in
the `plot` catch handler (which ate up user-defined catch handlers as of
1.15.0) [776, 789]
- Improve performance in `convertToSVG` step [791, 804]

Fixed
- Skip over non-container arrays in relink private key step (performance bug
introduced in 1.15.0) [817]
- Categorical heatmap traces with insufficient brick are now functional again
(bug introduced in 1.14.0) [783, 812]
- Fix `Plotly.validate` for info and container array attributes [814, 819]
- Range selector buttons can now be deleted via `relayout` [793]

Added
- Add `Plotly.validate` method [697]
- Add support for transforms plugins modules [499]
- Some partial bundles are now distributed in `dist/` [740]
- Mapbox access token can now be set in `layout.mapbox` [729]
- Undo/Redo queue length is now configurable via configuration option
`queueLength` [737]

Changed
- Improve performance in gl2d request animation frame loop [731]
- Improve `Lib.extendDeep` performance for primitive arrays [732]
- Improve potential XSS input in `text` fields [736]
- Improve scaling on scroll zoom for scatter lines and markers [761, 762]

Fixed
- `toImage` pixel output for gl2d graphs are now scaled properly [735]
- `scattermapbox` marker size and color arrays are now correctly converted when
they include repeated values [747]
- Fix scatter3d marker line color inheritance [754]
- `text` fields can now support link with query params `=` and `&` [736]
- Fix Chrome 50 bug where tester svg blocked other DOM nodes [745]

Fixed
- `Plotly.newPlot` correctly clears all present WebGL contexts [724]
- Bar traces with `layout.bargap` 0 and unset `marker.line.width` are functional
again (bug introduced in 1.3.0) [709]
- Stacked bar traces now correctly set the first bar position when leading gaps
are present (bug introduced in 1.11.0) [716]
- Bar traces with `layout.barmode` relative now correctly compute the bar sum of
the first position when positive and negative values are present [723]
- Event `plotly_relayout` is emitted upon pan / zoom on a mapbox subplot [727]
- Lasso and select box drag modes now work with fixed ranged axes [728]
- gl2d trace objects are purged when their parent scenes are destroyed [724]

Fixed
- Fix colorscale restyle calls on heatmap traces (bug introduced in 1.14.0)
[694]
- Hover after zoom / pan is now functional again in ternary plots (bug
introduced in 1.14.0) [688]
- Fix mapbox layer relayout starting from invisible layer [693]
- Hover labels when `hoveron: 'fills'` are now constrained to the viewports
[688]
- Fix `surface` contours description [696]
- Fix `mapbox.layers.line` description [690]

Added
- Attribute `line.color` in `scatter3d` traces now support color scales [617]
- Annotations tail positions can now be set in data coordinates via the new
`axref` and `ayref` attributes [610]
- Attribute `hoveron` is added for `scatter` and `scatterternary` traces which
adds the option to show hover labels about fill regions (instead of simply of
about data points) [673]
- Layout shapes can now be moved and resized (except for 'path' shapes) in
editable contexts [660]

Changed
- Numerous additions and changes where made to the mapbox layout layers
attributes (introduced in 1.13.0). Namely, `circle` and `symbol` layer type
where added. Note that some style attributes have been renamed to match the
mapbox-gl API more closely. [681]

Fixed
- Off-screen heatmap traces are properly deleted (bug introduced in 1.5.1)
[655]
- Hover labels for multi-heatmap subplot is functional again (bug introduced in
1.4.0) [655]
- Heatmap x/y brick generation is now functional for 0 and 1 item columns [651]
- Multiple layout images can now shared the same image source [672]
- Updating legend border and bgcolor attribute now works via `Plotly.relayout`
[652]
- Dragmode 'select' and 'lasso' no longer throw exception when selecting
`legendonly` traces [644]
- Ternary plots now respect the `staticPlot` config option [645]
- Descriptions for axes `nticks` and contour traces `ncountours`now properly
describe their behavior [662]

Added
- Python 3.5 has been added as a tested environment for this package.

Updated
- `plotly.plotly.create_animations` and `plotly.plotly.icreate_animations` now return appropriate error messages if the response is not successful.
- `frames` are now integrated into GRAPH_REFERENCE and figure validation.

Changed
- The plot-schema from `https://api.plot.ly/plot-schema` is no longer updated on import.