Update badge URL.

Author: RubenVerborgh

README.md

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 # OIDC Decentralized Authentication Manager
 
 [![](https://img.shields.io/badge/project-Solid-7C4DFF.svg?style=flat)](https://github.com/solid/solid)
-[![NPM Version](https://img.shields.io/npm/v/oidc-auth-manager.svg?style=flat)](https://npm.im/oidc-auth-manager)
+[![NPM Version](https://img.shields.io/npm/v/@solid/oidc-auth-manager.svg?style=flat)](https://www.npmjs.com/package/@solid/oidc-auth-manager)
 [![Build Status](https://travis-ci.org/solid/oidc-auth-manager.svg?branch=master)](https://travis-ci.org/solid/oidc-auth-manager)
 
 An OpenID Connect (OIDC) peer node (a combination Identity Provider, Relying