Add huntr for security issues

Author: carakas

README.md

@@ -3,6 +3,7 @@
 [![Build Status](https://travis-ci.org/forkcms/library.svg?branch=master)](https://travis-ci.org/forkcms/library)
 [![Latest Stable Version](https://poser.pugx.org/spoon/library/v/stable.svg)](https://packagist.org/packages/spoon/library)
 [![Code Coverage](https://scrutinizer-ci.com/g/forkcms/library/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/forkcms/library/?branch=master)
+[![huntr](https://cdn.huntr.dev/huntr_security_badge_mono.svg)](https://huntr.dev)
 
 Documentation, tutorials & much more can be found at:
 http://www.spoon-library.com