doc: more vanity badges

Author: mle86

README.md

@@ -2,6 +2,8 @@
 
 [![Build Status](https://travis-ci.org/mle86/php-value.svg?branch=master)](https://travis-ci.org/mle86/php-value)
 [![Coverage Status](https://coveralls.io/repos/github/mle86/php-value/badge.svg?branch=master)](https://coveralls.io/github/mle86/php-value?branch=master)
+[![Latest Stable Version](https://poser.pugx.org/mle86/value/version)](https://packagist.org/packages/mle86/value)
+[![License](https://poser.pugx.org/mle86/value/license)](https://packagist.org/packages/mle86/value)
 
 This PHP library provides a simple base class for Immutable Value Objects.
 Those are objects which wrap exactly one value,