Remove True Random (#795)

I don't see why this should be awesome. PHP offers a CSPRNG and mt_rand and covers all use cases well.

README.md

 * [SecurityMultiTool](https://github.com/padraic/SecurityMultiTool) - A PHP security library.
 * [SensioLabs Security Check](https://security.sensiolabs.org/) - A web tool to check your Composer dependencies for security advisories.
 * [TCrypto](https://github.com/timoh6/TCrypto) - A simple encrypted key-value storage library.
-* [True Random](https://github.com/pixeloution/true-random) - A library that generates random numbers using [www.random.org](https://www.random.org/).
 * [VAddy](https://vaddy.net/) - A continuous security testing platform for web applications.
 * [Zed](https://www.owasp.org/index.php/OWASP_Zed_Attack_Proxy_Project) - An integrated penetration testing tool for web applications.