v1.13.0

Added

• Beta version of the scattermapbox trace type - which allows users to create
  mapbox-gl maps using the plotly.js API. Note that scattermapbox is only
  available through custom bundling in this release [#626]
• Configurable log levels. All plotly.js logging is now turned off by default.
  Use Plotly.setPlotConfig({ logging: /* 1 or 2 */ }) to (1) display warnings
  only or (2) all logs [#590]
• Thorough mesh3d attribute descriptions [#593]

Changed

• Generalize hover picking routine (to make more easily re-usable for other plot
  types) [#575, #631]

Fixed

• Fix Plotly.toImage and Plotly.downloadImage bug specific to Chrome 51 on
  OSX [#604]
• Fix Plotly.downloadImage for svg types [#604]
• Fix scattergl opacity and connectgaps for 'lines' mode [#589]
• Make legend scroll bar keep its position after redraws [#584]
• Properly handle axis-reference shapes on overlaid axes [#612]
• Fix Plotly.relayout calls for layout.images in { astr: val } notation
  [#624]
• Bring back correct default value for lightposition in surface traces (bug
  introduced in 1.12.0) [#571]
• Fix typos in contours descriptions in contour traces [#583]
• Fix typos in axis.ticktext description [#607]
• Fix ambiguities in histogram nbin descriptions [#623]