Update geopandas example to support versions >=1.0 (fixes issue plotl…

…y#4778)

doc/python/scatter-plots-on-maps.md

@@ -74,13 +74,17 @@ fig.show()
 import plotly.express as px
 import geopandas as gpd
 
-geo_df = gpd.read_file(gpd.datasets.get_path('naturalearth_cities'))
+if gpd.__version__ < '1.0':
+    geo_df = gpd.read_file(gpd.datasets.get_path('naturalearth_cities'))
+else:
+    import geodatasets
+    geo_df = gpd.read_file(geodatasets.get_path('naturalearth_cities'))
 
 px.set_mapbox_access_token(open(".mapbox_token").read())
 fig = px.scatter_geo(geo_df,
-                    lat=geo_df.geometry.y,
-                    lon=geo_df.geometry.x,
-                    hover_name="name")
+                     lat=geo_df.geometry.y,
+                     lon=geo_df.geometry.x,
+                     hover_name="name")
 fig.show()
 ```