Merge pull request #1028 from voku/anti_xss

add "AntiXSS | Protection against Cross-site scripting (XSS) via PHP"

README.md

 ### Security
 *Libraries for generating secure random numbers, encrypting data and scanning and testing for vulnerabilities.*
 
+* [AntiXSS](https://github.com/voku/anti-xss) - A library that tries to preventing Cross-Site Scripting (XSS) attacks by blacklisting.
 * [Halite](https://paragonie.com/project/halite) - A simple library for encryption using [libsodium](https://github.com/jedisct1/libsodium).
 * [HTML Purifier](https://github.com/ezyang/htmlpurifier) - A standards compliant HTML filter.
 * [Optimus](https://github.com/jenssegers/optimus) - Id obfuscation based on Knuth's multiplicative hashing method.