title: CodeIgniter does not find guzzlehttp
body: <p>I'm working with CodeIgniter 3 and PHP 5.7.
  I add in composer <code>guzzlehttp</code> with the following command:</p>
  
  <pre><code>composer require guzzlehttp/guzzle:~6.0
  </code></pre>
  
  <p>In my <code>config.php</code> I put</p>
  
  <pre><code>$config['composer_autoload'] = TRUE;
  </code></pre>
  
  <p>In my library I use</p>
  
  <pre><code>$client = new GuzzleHttp\Client();
  </code></pre>
  
  <p>But the output is:</p>
  
  <blockquote>
    <p>Severity: Error</p>
    
    <p>Message: Class 'GuzzleHttp\Client' not found</p>
  </blockquote>