docs(README): fix snyk badge (#937)

Author: chimurai

README.md

@@ -2,7 +2,7 @@
 
 [![GitHub Workflow Status (with branch)](https://img.shields.io/github/actions/workflow/status/chimurai/http-proxy-middleware/ci.yml?branch=master&logo=github-actions&logoColor=white&style=flat-square)](https://github.com/chimurai/http-proxy-middleware/actions/workflows/ci.yml?query=branch%3Amaster)
 [![Coveralls](https://img.shields.io/coveralls/chimurai/http-proxy-middleware.svg?style=flat-square&logo=coveralls)](https://coveralls.io/r/chimurai/http-proxy-middleware)
-[![Snyk Vulnerabilities for GitHub Repo](https://img.shields.io/snyk/vulnerabilities/github/chimurai/http-proxy-middleware?logo=snyk&style=flat-square)](https://security.snyk.io/package/npm/http-proxy-middleware)
+[![Known Vulnerabilities](https://snyk.io/test/github/chimurai/http-proxy-middleware/badge.svg)](https://snyk.io/test/github/chimurai/http-proxy-middleware)
 [![npm](https://img.shields.io/npm/v/http-proxy-middleware?color=%23CC3534&style=flat-square&logo=npm)](https://www.npmjs.com/package/http-proxy-middleware)
 [![npm (tag)](https://img.shields.io/npm/v/http-proxy-middleware/beta?color=CC3534&logo=npm&style=flat-square)](https://github.com/chimurai/http-proxy-middleware/discussions/768)