v1.11.0

Added

• Add top-level methods Plotly.toImage to convert a plotly graph to an image
  data URL (svg, png, jpg, and webp are supported) and Plotly.downloadImage to
  download a plotly graph as an image [#446]
• Add the ability to add arbitrary images loaded from a url to a plot's layout
  [#525]
• Add the option of making legend span horizontally [#535]
• Add connectgaps attribute to scattergl traces [#449]
• Add new 'relative' bar mode which stacks on top of one another with negative
  values below the axis, positive values above [#517]
• Add support for the 'winkel tripel' projection in geo subplots [#492]
• Event plotly_relayout is now emitted on gl2d subplot drag/pan/zoom
  interactions [#466]
• Add support for fill coloring in contourgl traces [#522, #543]

Changed

• Cartesian on-hover routine is now uses a 50ms interval between search calls
  instead of 100ms for smoother displaying hover labels [#514]
• [Internal change] fullLayout _has fields are replaced by a _has method
  which checks if a particular plot type is present on a graph [#491]

Fixed

• Bar widths of traces with null coordinates are now correctly computed [#542]
• Error bar spans on bar traces with null coordinates are now correctly computed
  [#542]
• All promises spawn in Plotly.plot are now guaranteed to be resolved before
  the final resolve [#521]
• Restyling scatterternary data attributes is now working [#540]
• Error bar of 0 length in log axes are not included in hover labels (instead of
  showing NaNs) [#533]