title: cakephp3 session deprecated
body: <p>I have update into my project the last version of cakephp core.
  Now I get this error:</p>
  
  <pre><code>Deprecated (16384): SessionHelper has been deprecated. Use request-&gt;session() instead. [CORE/src/View/Helper/sessionHelper.php, line 39]
  </code></pre>
  
  <p>The error I think is in this line:</p>
  
  <pre><code>if ($this-&gt;session-&gt;read('admin_logged_in')){
  </code></pre>
  
  <p>What should I use instead?</p>
  
  <p>Thanks</p>