v.1.10.2

• BUGFIX: Fixed type coercion for plot_options.series.data_labels to allow for series type-specific
  label classes. Closes #209.
• BUGFIX: Modified the default Referer and User-Agent strings for use when exporting charts.
• DOCS: Added some additional documentation around the User-Agent and Referer support for use when
  exporting charts.
• ENHANCEMENT: Some minor refactoring.

v.1.10.1

• BUGFIX: Fixed missing handling of JS module for HeatmapOptions and HeatmapSeries (closes #207).

v.1.10.0

• ENHANCEMENT: Added User-Agent and Referer support to the ExportServer class to accommodate
  new security measures on Highsoft's public Export Server instance.
• BUGFIX: Adjusted handling of NumPy datetime64 values to serialize them to Unix epoch-based milliseconds,
  rather than the default nanoseconds (closes #204).
• DOCS: Added examples of adjusting datetime64 values to epoch-based milliseconds (courtesy of @ThomasGl).

v.1.9.4

• BUGFIX: Fixed TypeError which occurred on certain np.isnan() operations when serializing to JS
  Literal (courtesy of @ThomasGl) (closes #200).

v.1.9.3

• BUGFIX: Fixed incorrect export serialization of Highcharts Maps for Python map topologies.
• BUGFIX: Added support for value 'allow' to DataLabel.overflow property. Fixes #198.
• DOCS: Fixed some typos in documentation (courtesy of @JulienBacquart).

v.1.9.2

• BUGFIX: Resolved over-broad False-y validation of PieDataLabel.distance to allow for 0
  values. Closes #192.
• BUGFIX: Fixed over-broad False-y validation of Tooltip.header_format to allow for empty string
  values, bringing it in line with Tooltip.footer_format. Closes #193.

v.1.9.1

• ENHANCEMENT: Added stringified JSON serialization of callback functions when serializing via
  .to_json(for_export = True).

v.1.9.0

• BUGFIX: Fixed missing serialization/de-serialization of ChartEvents.render.
• BUGFIX: Added new utility_classes.data_labels.PieDataLabel class to ensure support for
  the .distance property on Pie-chart (and descended) data labels. Closes #183.
• BUGFIX: Fixed options.chart.height type validation to accept string values as per JS API.
  (Issue reported in #184).
• BUGFIX: Added missing support for options.plot_options.sunburst.SunburstOptions.border_radius
  (issue reported in #184).
• BUGFIX: Added support for concatenation via + operator in JS literal strings when parsed by
  .from_js_literal(). Closes #185.
• ENHANCEMENT: Added support for utility_classes.border_radius.BorderRadius object.

v.1.8.2

• BUGFIX: Added missing support for 'areaMarker' legend symbol.
• DOCS: Fixed some typos (courtesy of @JulienBacquart).

v.1.8.1

• ENHANCEMENT: Added resources (files, js, and css) support to chart export.