Remove old library. Add Symfony HTTP Client.

README.md

 
 * [Buzz](https://github.com/kriswallsmith/Buzz) - Another HTTP client.
 * [Guzzle]( https://github.com/guzzle/guzzle) - A comprehensive HTTP client.
-* [HTTPFul](https://github.com/nategood/httpful) - A chainable HTTP client.
 * [HTTPlug](http://httplug.io) - An HTTP client abstraction without binding to a specific implementation.
 * [PHP VCR](https://php-vcr.github.io/) - A library for recording and replaying HTTP requests.
 * [Requests](https://github.com/rmccue/Requests) - A simple HTTP library.
 * [Retrofit](https://github.com/tebru/retrofit-php) - A library to ease creation of REST API clients.
+* [Symfony HTTP Client](https://symfony.com/doc/current/components/http_client.html) - A component to fetch HTTP resources synchronously or asynchronously.
 * [zend-diactoros](https://github.com/zendframework/zend-diactoros) - PSR-7 HTTP Message implementation.
 
 ### Scraping
 
 * [Embed](https://github.com/oscarotero/Embed) - An information extractor from any web service or page.
 * [Goutte](https://github.com/FriendsOfPHP/Goutte) - A simple web scraper.
+* [Symfony Panther](https://github.com/symfony/panther) - A browser testing and web crawling library for PHP and Symfony.
 * [PHP Spider](https://github.com/mvdbos/php-spider) - A configurable and extensible PHP web spider.
 
 ### Middlewares