docs(readme): add snyk badge for generated deps

[skip ci]

Author: Awk34

Diff for: readme.md

@@ -11,6 +11,7 @@
 #### Generated project: 
 [![Dependency Status](https://img.shields.io/david/angular-fullstack/angular-fullstack-deps.svg)](https://david-dm.org/angular-fullstack/angular-fullstack-deps)
 [![Dev-Dependency Status](https://img.shields.io/david/dev/angular-fullstack/angular-fullstack-deps.svg)](https://david-dm.org/angular-fullstack/angular-fullstack-deps#info=devDependencies)
+[![Known Vulnerabilities](https://snyk.io/package/npm/angular-fullstack-deps/badge.svg)](https://snyk.io/package/npm/angular-fullstack-deps)
 
 ## Usage