add link to npm

Author: ashphy

README.md

@@ -1,7 +1,7 @@
 # jsonpath-js
 
 ![GitHub License](https://img.shields.io/github/license/ashphy/jsonpath-js)
-![NPM Version](https://img.shields.io/npm/v/jsonpath-js)
+[![NPM Version](https://img.shields.io/npm/v/jsonpath-js)](https://www.npmjs.com/package/jsonpath-js)
 [![Link Checker](https://github.com/ashphy/jsonpath-js/actions/workflows/lint.yml/badge.svg)](https://github.com/ashphy/jsonpath-js/actions/workflows/lint.yml)
 
 An implementation of RFC 9535 [JSONPath](http://goessner.net/articles/JsonPath/)