Add requirements to readme and remove broken dependency badges

README.md

@@ -1,11 +1,13 @@
 # Packagist API
 
 [![Build Status](https://travis-ci.org/KnpLabs/packagist-api.svg)](https://travis-ci.org/KnpLabs/packagist-api) [![Latest Stable Version](https://poser.pugx.org/KnpLabs/packagist-api/v/stable.png)](https://packagist.org/packages/KnpLabs/packagist-api) [![Total Downloads](https://poser.pugx.org/KnpLabs/packagist-api/downloads.png)](https://packagist.org/packages/KnpLabs/packagist-api)
-[![Dependency Status](https://www.versioneye.com/php/knplabs:packagist-api/badge.svg)](https://www.versioneye.com/php/knplabs:packagist-api)
-[![Reference Status](https://www.versioneye.com/php/knplabs:packagist-api/reference_badge.svg?style=flat)](https://www.versioneye.com/php/knplabs:packagist-api/references)
 
 Simple object oriented wrapper for Packagist API.
 
+## Requirements
+
+* PHP ^7.1
+
 ## Installation
 
 The recommended way to install Packagist API is through composer: