Added php-defer/php-defer (#1025)

README.md

 * [Hoa EventSource](https://github.com/hoaproject/Eventsource) - An event source library.
 * [Hoa WebSocket](https://github.com/hoaproject/Websocket) - Another web socket library.
 * [Prooph Event Store](https://github.com/prooph/event-store) - An event source component to persist event messages
+* [PHP Defer](https://github.com/php-defer/php-defer) - Golang's defer statement for PHP.
 * [Ratchet](https://github.com/ratchetphp/Ratchet) - A web socket library.
 * [React](https://github.com/reactphp/react) - An event driven non-blocking I/O library.
 * [RxPHP](https://github.com/ReactiveX/RxPHP) - A reactive extension library.