update dependencies, tests, copyright + add badges to README.md

LICENSE

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 The MIT License (MIT)
 
-Copyright (c) 2019-2021 Gabriele Lauricella
+Copyright (c) 2019-2023 Gabriele Lauricella
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

README.md

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 # Weather underground client for node.js
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+[![npm version](https://img.shields.io/npm/v/weather-underground-node.svg)](https://www.npmjs.com/package/weather-underground-node)
+[![Npm download](https://img.shields.io/npm/dm/weather-underground-node.svg)](https://www.npmjs.com/package/weather-underground-node)
+[![GitHub stars](https://img.shields.io/github/stars/gablau/weather-underground-node.svg)](https://github.com/gablau/weather-underground-node/stargazers)
+[![GitHub issues](https://img.shields.io/github/issues/gablau/weather-underground-node.svg)](https://github.com/gablau/weather-underground-node/issues)
+[![License](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/gablau/weather-underground-node/blob/master/LICENSE)
+
+[![NPM](https://nodei.co/npm/weather-underground-node.png?downloads=true&downloadRank=true&stars=true)](https://www.npmjs.com/package/weather-underground-node)
+
+---
 ## NEW 2019 API from The Weather Company (IBM) only for PWS owners
 
 The Weather Company (IBM), which acquired Weather Underground in 2012, withdrew the API Weather Underground in March 2019 (see: [End of Service for the Weather Underground API](https://web.archive.org/web/20200220003108/https://apicommunity.wunderground.com/weatherapi/topics/end-of-service-for-the-weather-underground-api) last update 20-02-2020 by [WaybackMachine](https://web.archive.org/))