chore: remove snyk badge as it is not working

Author: ayZagen

README.md

@@ -15,9 +15,6 @@
 <a href="https://codecov.io/gh/PlusAuth/oidc-client-js">
 <img alt="Codecov" src="https://img.shields.io/codecov/c/gh/PlusAuth/oidc-client-js?logo=codecov&style=flat">
 </a>
-<a href="https://snyk.io/test/github/PlusAuth/oidc-client-js">
-<img src="https://img.shields.io/snyk/vulnerabilities/github/PlusAuth/oidc-client-js?style=flat" alt="Vulnerabilities">
-</a>
 <a href="https://github.com/PlusAuth/oidc-client-js/blob/master/LICENSE">
 <img alt="license" src="https://img.shields.io/npm/l/@plusauth/oidc-client-js?style=flat">
 </a>