title: Non-static method Cartalyst\Sentinel\Sentinel::getUser() should not be called statically
body: <p>Hi I am using laravel Sentinel as my Auth, also I am trying to use laravel auditing I am getting "Non-static method Cartalyst\Sentinel\Sentinel::getUser() should not be called statically".</p>
  
  <p>In my user model I have added a static function resolveId() for adding user_id in Laravel Auditing 'audits' table</p>
  
  <pre><code>public static function resolveId(){
      return Sentinel::getUser()-&gt;getUserId();
      //return auth()-&gt;check() ? auth()-&gt;user()-&gt;getAuthIdentifier() : null;
  }
  </code></pre>
  
  <p>When I try to use \Sentinel::getUser() I am getting the error below.</p>
  
  <pre><code>Non-static method Cartalyst\Sentinel\Sentinel::getUser() should not be called statically
  </code></pre>