v1.12.0

Added

• Light positions, face normal epsilon and vertex normal epsilon are now
  configurable in mesh3d traces [#556]
• Light position is now configurable in surface traces [#556]
• surface and mesh3d lighting attributes are now accompanied with
  comprehensive descriptions. [#556]

Changed

• Plot modules are now allowed to have their own toSVG method for
  subplot-specific to-svg logic [#554]

Fixed

• gl2d plots are now functional in core-js environments (e.g. in babel es6
  presets) [#569]
• gl2d replot calls from a blank plot are now functional [#570]
• SVG graph config argument scrollZoom is now again functional (bug introduced
  in v1.10.0) [#564]
• layout.separators is now honored in pie text labels [#547]
• Heatmap zsmooth value 'fast' is now functional for arbitrary layout widths
  [#548]
• Range sliders now respond to all axis range relayout calls [#568]