Merge pull request #603 from jenssegers/patch-3

Suggest Optimus

README.md

 * [SensioLabs Security Check](https://security.sensiolabs.org/) - A web tool to check your Composer dependencies for security advisories.
 * [Zed](https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project) - An integrated penetration testing tool for web applications.
 * [VAddy](http://vaddy.net) - A continuous security testing platform for web applications.
+* [Optimus](https://github.com/jenssegers/optimus) - Id obfuscation based on Knuth's multiplicative hashing method.
 
 ## Passwords
 *Libraries and tools for working with and storing passwords.*