improve readme

Author: frederikbosch

README.MD

@@ -1,12 +1,13 @@
-PHP Genkgo v1 API Connector
+PHP Genkgo v2 API Connector
 ============================================
 
 [![Build Status](https://travis-ci.org/genkgo/api.png?branch=master)](https://travis-ci.org/genkgo/api)
 
 ## Usage
 
-Add genkgo/api to your dependencies and install them. You can have a look at [one of the
-examples](examples) or see the [docs](docs/index.md).
+Add `genkgo/api` and implementation of `psr/http-client` and `psr/http-factory` to your dependencies and install them. 
+You can have a look at [one of the examples](examples) or see the [docs](docs/index.md). The examples rely on 
+[Guzzle](https://github.com/guzzle/guzzle) and [Guzzle PSR-7](https://github.com/guzzle/psr7) for the http implementations.
 
 ```php
 <?php

examples/example.create.and.delete.person.php

@@ -3,9 +3,10 @@
 
 use Genkgo\Api\Connection;
 use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\HttpFactory;
 
 $config = require_once 'config.php';
-$connection = new Connection(new Client(), $config['url'], $config['token']);
+$connection = new Connection(new Client(), new HttpFactory(), $config['url'], $config['token']);
 
 $folder = $connection->command('organization', 'find', [
     'name' => 'Aanmeldingen'

examples/example.login.php

@@ -3,9 +3,10 @@
 
 use Genkgo\Api\Connection;
 use GuzzleHttp\Client;
+use GuzzleHttp\Psr7\HttpFactory;
 
 $config = require_once 'config.php';
-$connection = new Connection(new Client(), $config['url'], $config['token']);
+$connection = new Connection(new Client(), new HttpFactory(), $config['url'], $config['token']);
 
 $result = $connection->command('organization', 'login', [
     'uid' => 'test',