Add some badges to README

Author: suin

README.md

@@ -4,8 +4,11 @@
 
 This library can also be used to publish Podcasts.
 
-The build status of the current master branch is tracked by Travis CI: [![Build Status](https://secure.travis-ci.org/suin/php-rss-writer.png?branch=master)](http://travis-ci.org/suin/php-rss-writer)
-
+[![Latest Stable Version](https://poser.pugx.org/suin/php-rss-writer/v/stable)](https://packagist.org/packages/suin/php-rss-writer)
+[![Total Downloads](https://poser.pugx.org/suin/php-rss-writer/downloads)](https://packagist.org/packages/suin/php-rss-writer) 
+[![Daily Downloads](https://poser.pugx.org/suin/php-rss-writer/d/daily)](https://packagist.org/packages/suin/php-rss-writer)
+[![License](https://poser.pugx.org/suin/php-rss-writer/license)](https://packagist.org/packages/suin/php-rss-writer)
+[![Build Status](https://secure.travis-ci.org/suin/php-rss-writer.png?branch=master)](http://travis-ci.org/suin/php-rss-writer)
 
 ## Quick demo