Update README.md

Author: wenbinf

README.md

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 # Podcast API JavaScript Library
 
-[![Node.js CI](https://github.com/ListenNotes/podcast-api-js/actions/workflows/node.js.yml/badge.svg)](https://github.com/ListenNotes/podcast-api-js/actions/workflows/node.js.yml)
+[![Node.js CI](https://github.com/ListenNotes/podcast-api-js/actions/workflows/node.js.yml/badge.svg)](https://github.com/ListenNotes/podcast-api-js/actions/workflows/node.js.yml) ![npm](https://img.shields.io/npm/v/podcast-api)
 
 The Podcast API JavaScript library provides convenient access to the [Listen Notes Podcast API](https://www.listennotes.com/api/) from
 applications written in server-side JavaScript.