chore: updated readme

Author: aziis98

README.md

@@ -1,6 +1,6 @@
 # DM-Planimetrie
 
-![NPM Version](https://img.shields.io/npm/v/dm-planimetrie)
+<a href="https://www.npmjs.com/package/dm-planimetrie"><img src="https://img.shields.io/npm/v/dm-planimetrie" alt="npm version"></a>
 
 This project is a JavaScript-based application that renders a planimetry of the
 Department of Mathematics in Pisa, and lets you interact with it by selecting