Added docs about unsupported series types on export.

Author: hcpchris

docs/errors.rst

@@ -206,6 +206,18 @@ HighchartsUnsupportedProtocolError (from :class:`ValueError <python:ValueError>`
 
 --------------
 
+HighchartsUnsupportedExportError (from :class:`ValueError <python:ValueError>`)
+==========================================================================================
+
+.. autoexception:: HighchartsUnsupportedExportError
+
+  .. collapse:: Class Inheritance
+
+    .. inheritance-diagram:: HighchartsUnsupportedExportError
+      :parts: -1
+
+--------------
+
 HighchartsUnsupportedExportTypeError (from :class:`ValueError <python:ValueError>`)
 ==========================================================================================
 

docs/using.rst

@@ -904,6 +904,13 @@ environment. The actual file itself is produced using a
 
     .. include:: using/download_visualizations/_using_custom.rst
 
+.. warning::
+
+  As of Highcharts for Python v.1.1.0, the Highcharts :term:`Export Server` does not yet fully 
+  support all of the series types added in Highcharts (JS) v.11. Attempting to programmatically download
+  one of those new as-yet-unsupported visualizations will generate a 
+  :exc:`HighchartsUnsupportedExportError <highcharts_gantt.errors.HighchartsUnsupportedExportError>`.
+
 -----------------------------
 
 .. target-notes::