title: Laravel 5.6 ytake/laravel-couchbase authentication issue
body: <p>I am using laravel 5.6 and using couchbase SDK to establish the database connection. When I run the test on core PHP I am able to access the bucket but using ytake/laravel-couchbase package it's throwing an error of authentication.
  My code looks like below:</p>
  
  <pre><code>public function index()
  {
      $authenticator = new \Couchbase\PasswordAuthenticator();
      $authenticator-&gt;username('test')-&gt;password('test123');
      print_r($authenticator);
      \DB::connection('couchbase')-&gt;table('`test-lab`')-&gt;get();
  }
  </code></pre>
  
  <p>I am not able to figure out how to authenticate using mentioned package or if it automatically does that so what's wrong here.</p>