AirVisual API's nearest_city endpoint response CodingKeys extensions

AirVisualNearestCityResponseCodingKeys.swift

// MARK: - CodingKeys

extension AirVisualNearestCityData {
    enum CodingKeys: String, CodingKey {
        case city = "city"
        case currentConditions = "current"
    }
}

extension AirVisualWeather {
    enum CodingKeys: String, CodingKey {
        case timestamp = "ts"
        case iconCode = "ic"
        case temperature = "tp"
        case humidity = "hu"
        case pressure = "pr"
        case windSpeed = "ws"
        case windDirection = "wd"
    }
}

extension AirVisualPollution {
    enum CodingKeys: String, CodingKey {
        case timestamp = "ts"
        case aqiUS = "aqius"
        case mainPollutantUS = "mainus"
        case aqiChina = "aqicn"
        case mainPollutantChina = "maincn"
    }
}