Removed broken Snyk badges

Author: robtimus

README.md

@@ -3,7 +3,6 @@
 [![Build Status](https://github.com/robtimus/obfuscation-json/actions/workflows/build.yml/badge.svg)](https://github.com/robtimus/obfuscation-json/actions/workflows/build.yml)
 [![Quality Gate Status](https://sonarcloud.io/api/project_badges/measure?project=com.github.robtimus%3Aobfuscation-json&metric=alert_status)](https://sonarcloud.io/summary/overall?id=com.github.robtimus%3Aobfuscation-json)
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=com.github.robtimus%3Aobfuscation-json&metric=coverage)](https://sonarcloud.io/summary/overall?id=com.github.robtimus%3Aobfuscation-json)
-[![Known Vulnerabilities](https://snyk.io/test/github/robtimus/obfuscation-json/badge.svg)](https://snyk.io/test/github/robtimus/obfuscation-json)
 
 Provides functionality for obfuscating JSON documents. This can be useful for logging such documents, e.g. as part of request/response logging, where sensitive properties like passwords should not be logged as-is.