old_contents: class WateringService:
      def __init__(self, watering_config):
          self.__config = watering_config
  
      def calculate_milliseconds(self, soil_moisture):
          if soil_moisture > self.__config['minSoilMoisture']:
              # no watering
              return 0
  
          # watering
          return self.__config['wateringMilliseconds']
  
new_contents: class WateringService:
      def __init__(self, watering_config):
          self.__config = watering_config
  
      def calculate_milliseconds(self, soil_moisture):
          if soil_moisture > int(self.__config['minSoilMoisture']):
              # no watering
              return 0
  
          # watering
          return int(self.__config['wateringMilliseconds'])
  
subject: fix convert watering settings to integer