Update README.md

Author: JMPerez

README.md

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-# Spotify Web API JS [![Build Status](https://travis-ci.org/JMPerez/spotify-web-api-js.svg?branch=master)](https://travis-ci.org/JMPerez/spotify-web-api-js) [![Coverage Status](https://coveralls.io/repos/JMPerez/spotify-web-api-js/badge.svg)](https://coveralls.io/r/JMPerez/spotify-web-api-js) [![Greenkeeper badge](https://badges.greenkeeper.io/JMPerez/spotify-web-api-js.svg)](https://greenkeeper.io/) <a href="https://www.buymeacoffee.com/jmp" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 20px !important;width: 87px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>
+# Spotify Web API JS [![Build Status](https://travis-ci.org/JMPerez/spotify-web-api-js.svg?branch=master)](https://travis-ci.org/JMPerez/spotify-web-api-js) [![Coverage Status](https://coveralls.io/repos/JMPerez/spotify-web-api-js/badge.svg)](https://coveralls.io/r/JMPerez/spotify-web-api-js) [![Greenkeeper badge](https://badges.greenkeeper.io/JMPerez/spotify-web-api-js.svg)](https://greenkeeper.io/) <a href="https://www.buymeacoffee.com/jmp"><img src="https://img.buymeacoffee.com/button-api/?text=Buy me a coffee&emoji=&slug=jmp&button_colour=BD5FFF&font_colour=ffffff&font_family=Poppins&outline_colour=000000&coffee_colour=FFDD00" height="20"></a>
 
 This is a lightweight wrapper for the [Spotify Web API](https://developer.spotify.com/web-api/) ([2.6kB gzipped + compressed](https://cost-of-modules.herokuapp.com/result?p=spotify-web-api-js)). It includes helper functions for **all Spotify's endpoints**, such as fetching metadata (search and look-up of albums, artists, tracks, playlists, new releases, podcasts) and user's information (follow users, artists and playlists, and saved tracks management).