change entity.py to use extra_state_attributes (#66)

custom_components/integration_blueprint/entity.py

@@ -24,7 +24,7 @@ class IntegrationBlueprintEntity(CoordinatorEntity):
         }
 
     @property
-    def device_state_attributes(self):
+    def extra_state_attributes(self):
         """Return the state attributes."""
         return {
             "attribution": ATTRIBUTION,