weather library Null safety

Classes

WeatherDaily
逐天预报
WeatherDailyResp
逐天预报查询结果
WeatherHourly
逐时预报
WeatherHourlyResp
逐时预报查询结果
WeatherMinutel
分钟降水
WeatherMinutelyResp
分钟降水查询结果
WeatherNow
实时天气
WeatherNowResp
实时天气查询结果