Merge pull request #168 from akeneo/fitn-patch-1

Update README.md

Author: fitn

README.md

@@ -34,7 +34,7 @@ $ curl -s http://getcomposer.org/installer | php
 
 Then, run the following command to require the library:
 ```bash
-$ php composer.phar require akeneo/api-php-client php-http/guzzle6-adapter:^2.0
+$ php composer.phar require akeneo/api-php-client php-http/guzzle6-adapter:^2.0 http-interop/http-factory-guzzle:^1.0
 ```
 
 If you want to use another HTTP client implementation, you can check [here](https://packagist.org/providers/php-http/client-implementation) the full list of HTTP client implementations.