v1.16.0

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]