readme: add Snyk badge

Author: markus-wa

README.md

@@ -8,6 +8,7 @@ A blazing fast, feature complete and production ready Go library for parsing and
 [![Go Report](https://goreportcard.com/badge/github.com/markus-wa/demoinfocs-golang)](https://goreportcard.com/report/github.com/markus-wa/demoinfocs-golang)
 [![License](https://img.shields.io/badge/license-MIT-blue.svg?style=flat)](LICENSE.md)
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2Fmarkus-wa%2Fdemoinfocs-golang.svg?type=shield)](https://app.fossa.io/projects/git%2Bgithub.com%2Fmarkus-wa%2Fdemoinfocs-golang?ref=badge_shield)
+[![Snyk Scan](https://img.shields.io/badge/security%20scan-snyk-blueviolet)](https://app.snyk.io/org/markus-wa/project/4103d506-a2ae-4d16-a93b-c31b069268e2)
 
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