docs(core): add Snyk badge to README to show known vulnerabilities in…

… project/dependencies

README.md

@@ -7,6 +7,7 @@ parse-domain
 [![Dependency Status](https://david-dm.org/peerigon/parse-domain.svg)](https://david-dm.org/peerigon/parse-domain)
 [![Build Status](https://travis-ci.org/peerigon/parse-domain.svg?branch=master)](https://travis-ci.org/peerigon/parse-domain)
 [![Coverage Status](https://img.shields.io/coveralls/peerigon/parse-domain.svg)](https://coveralls.io/r/peerigon/parse-domain?branch=master)
+[![Known Vulnerabilities](https://snyk.io/test/github/peerigon/parse-domain/badge.svg)](https://snyk.io/test/github/peerigon/parse-domain)
 
 Since domains are handled differently across different countries and organizations, splitting a URL into sub-domain, domain and top-level-domain parts is not a simple regexp. **parse-domain** uses a [large list of known top-level domains](https://publicsuffix.org/list/public_suffix_list.dat) from publicsuffix.org to recognize different parts of the domain.