docs: added snyk badge

Signed-off-by: Jonathan <theflametrooper@gmail.com>

README.md

@@ -2,6 +2,8 @@
 
 > [npmjs.com/package/config](https://npmjs.com/package/config) for client side JavaScript
 
+[![Known Vulnerabilities](https://snyk.io//test/github/jonathan-grah/lofig/badge.svg?targetFile=package.json)](https://snyk.io//test/github/jonathan-grah/lofig?targetFile=package.json)
+
 ## Installation
 
 `npm install lofig --save --production`