Fix redirects.

README.md

 * [CakePHP](https://cakephp.org/) - A rapid application development framework (CP).
 * [Laravel 6](https://laravel.com/) - Another PHP framework (L6).
 * [Nette](https://nette.org) - Another framework comprised of individual components.
-* [Phalcon](https://phalcon.io/en/) - A framework implemented as a C extension.
+* [Phalcon](https://phalcon.io/en-us/ ) - A framework implemented as a C extension.
 * [PPI Framework 2](https://github.com/ppi) - An interoperability framework.
 * [Symfony](https://symfony.com/) - A framework comprised of individual components (SF).
 * [Yii2](https://github.com/yiisoft/yii2/) - Another PHP framework.
 * [Tracy](https://github.com/nette/tracy) - A simple error detection, logging and time measuring library.
 * [xDebug](https://github.com/xdebug/xdebug) - A debug and profile tool for PHP.
 * [XHProf](https://github.com/phacility/xhprof) - A profiling tool originally developed by Facebook.
-* [Z-Ray](https://www.zend.com/products/server/z-ray) - A debug and profile tool for Zend Server.
+* [Z-Ray](https://www.zend.com/products/z-ray) - A debug and profile tool for Zend Server.
 
 ### Build Tools
 *Project build and automation tools.*