Update docs for v2.5.1

Author: jorgeborges

CHANGELOG.md

@@ -1,4 +1,7 @@
 ## Version 2
+### 2.5.1 (2017-03-20)
+ * Fixing required params for all hits, either Client ID or User ID
+
 ### 2.5.0 (2017-03-20)
  * Fixing required params for Products, by @rhrebecek
  * Making Analytics class completely extensible

README.md

@@ -1,6 +1,6 @@
 Google Analytics Measurement Protocol library for PHP
 ===========================
-[![Build Status](https://travis-ci.org/theiconic/php-ga-measurement-protocol.svg?branch=v2.5.0)](https://travis-ci.org/theiconic/php-ga-measurement-protocol) [![Coverage Status](https://coveralls.io/repos/theiconic/php-ga-measurement-protocol/badge.svg?branch=master&service=github)](https://coveralls.io/github/theiconic/php-ga-measurement-protocol?branch=master) [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/theiconic/php-ga-measurement-protocol/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/theiconic/php-ga-measurement-protocol/?branch=master) [![Latest Stable Version](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/v/stable)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![Total Downloads](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/downloads)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![License](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/license)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![Documentation Status](https://readthedocs.org/projects/php-ga-measurement-protocol/badge/?version=latest)](http://php-ga-measurement-protocol.readthedocs.org/en/latest/) [![Dependency Status](https://www.versioneye.com/user/projects/54fa7f46fcd47acff1000068/badge.svg?style=flat)](https://www.versioneye.com/user/projects/54fa7f46fcd47acff1000068)
+[![Build Status](https://travis-ci.org/theiconic/php-ga-measurement-protocol.svg?branch=v2.5.1)](https://travis-ci.org/theiconic/php-ga-measurement-protocol) [![Coverage Status](https://coveralls.io/repos/theiconic/php-ga-measurement-protocol/badge.svg?branch=master&service=github)](https://coveralls.io/github/theiconic/php-ga-measurement-protocol?branch=master) [![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/theiconic/php-ga-measurement-protocol/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/theiconic/php-ga-measurement-protocol/?branch=master) [![Latest Stable Version](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/v/stable)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![Total Downloads](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/downloads)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![License](https://poser.pugx.org/theiconic/php-ga-measurement-protocol/license)](https://packagist.org/packages/theiconic/php-ga-measurement-protocol) [![Documentation Status](https://readthedocs.org/projects/php-ga-measurement-protocol/badge/?version=latest)](http://php-ga-measurement-protocol.readthedocs.org/en/latest/) [![Dependency Status](https://www.versioneye.com/user/projects/54fa7f46fcd47acff1000068/badge.svg?style=flat)](https://www.versioneye.com/user/projects/54fa7f46fcd47acff1000068)
 
 ## Description