Fixed missing super call in AreaRangeOptions.

Author: hcpchris

highcharts_core/options/plot_options/area.py

@@ -227,6 +227,8 @@ def __init__(self, **kwargs):
 
         self.low_marker = kwargs.get('low_marker', None)
 
+        super().__init__(**kwargs)
+        
     @property
     def low_marker(self) -> Optional[Marker]:
         """Options for the point markers of line-like series.