title: Update stripe connect account's legal entity
body: <p>I'm retrieving a connected account thanks to Stripe PHP library, updating a few information and  trying to save it. But, it throws this error message:</p>
  
  <blockquote>
    <p>This account can only be updated with an account token, because it was
    originally created with an account token. (Attempted to update param
    'legal_entity' directly.)</p>
  </blockquote>
  
  <p>Here is my code:</p>
  
  <pre><code>\Stripe\Stripe::setApiKey('sk_MYSTRIPESECRETKEY');
  $account = \Stripe\Account::retrieve(ACCOUNT_ID);
  $account['legal_entity'] = array('dob' =&gt; array('day' =&gt; 01,'month' =&gt; 01,'year' =&gt; 1970));
  $account-&gt;save();
  </code></pre>
  
  <p>What am I doing wrong ?</p>