Highcharts-maps

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* **BUGFIX:** Fixed the use of an improper constructor when exporting Map charts.
* **ENHANCEMENT:** Bumped requirement to use latest version of Highcharts Core for Python, which
also fixes an export-related serialization error.
* **ENHANCEMENT:** Bumped ``requests`` version number for security patch.

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* **ENHANCEMENT:** Align the API to **Highcharts Maps (JS) v.11.4** (48). In particular, this includes:

* Updated requirements to depend on Highcharts Core for Python v.1.7.
* Added ``Accessibility.high_contrast_mode`` support.
* Added ``OrganizationOptions.hanging_side`` support.
* Added ``SankeyOptions.node_distance`` support.
* Added ``TreegraphOptions.node_distance`` support.
* Adjusted diagram (``ArcDiagramOptions``, ``TreegraphOptions``, ``DependencyWheelOptions``, and
``SankeyOptions``) ``.node_width`` support and documentation.
* Added ``NodeOptions.height`` support.

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.3** (45). In particular, this includes:

* Updated requirements to depend on Highcharts Core for Python v.1.6.
* Added ``ChartOptions.axis_layout_runs`` property.
* Added ``ColorAxis.height`` property.
* Added ``ColorAxis.width`` property.
* Added ``Data.column_types`` property.
* Added ``Exporting.fetch_options`` property.
* Implemented support for verbose axis date-time unit labelling configuration (see: ``DateTimeLabelFormats``).

* **DOCUMENTATION:** Fixed typos in **Getting Started** tutorial.

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* **BUGFIX:** Fixed incorrect assignment of ``options.chart.map`` value (42).

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* **ENHANCEMENT:** Align the API to **Highcharts (JS) v.11.2** (127). In particular, this includes:

* Added interpolation support to GeoHeatmap series type.
* Added ``AxisEvents.point_break_out`` property.
* Added ``.node_alignment`` property to ``SankeyOptions`` and ``SankeySeries``.
* Added ``.link_color_mode`` property to ``SankeyOptions`` and ``SankeySeries``.
* Added ``.inactive_other_points`` property to multiple series types.
* Added ``.grouping`` property to Lollipop series type.
* Added ``.low_marker`` property Area Range and Dumbell series types.
* Added ``.show_export_in_progress`` and ``.export_in_progress`` support.
* Added ``.drag`` annotation event support.

* **BUGFIX:** Fixed missing ``.levels`` support in ``TreegraphOptions`` and ``TreegraphSeries``.

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* **BUGFIX**: Fixed incorrect cross-dependency inheritance in
``options/series_generator.create_series_obj()`` (36)

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