Remove snyk badge, too many falso positives

However emails + CI integration is still enabled

Author: Joris-van-der-Wel

README.md

@@ -1,5 +1,5 @@
 # Computest Openrunner
-[![Build Status](https://travis-ci.org/computestdev/Openrunner.svg?branch=master)](https://travis-ci.org/computestdev/Openrunner) [![Coverage Status](https://coveralls.io/repos/github/computestdev/Openrunner/badge.svg?branch=master)](https://coveralls.io/github/computestdev/Openrunner?branch=master) [![Greenkeeper badge](https://badges.greenkeeper.io/computestdev/Openrunner.svg)](https://greenkeeper.io/) [![Known Vulnerabilities](https://snyk.io/test/github/computestdev/Openrunner/badge.svg)](https://snyk.io/test/github/computestdev/Openrunner)
+[![Build Status](https://travis-ci.org/computestdev/Openrunner.svg?branch=master)](https://travis-ci.org/computestdev/Openrunner) [![Coverage Status](https://coveralls.io/repos/github/computestdev/Openrunner/badge.svg?branch=master)](https://coveralls.io/github/computestdev/Openrunner?branch=master) [![Greenkeeper badge](https://badges.greenkeeper.io/computestdev/Openrunner.svg)](https://greenkeeper.io/)