title: Use of undefined constant OCI_CRED_EXT - assumed 'OCI_CRED_EXT' laravel
body: <p>I'm trying to connect oracle database to my laravel application using this package: <a href="https://github.com/yajra/laravel-oci8" rel="nofollow noreferrer">https://github.com/yajra/laravel-oci8</a> but having error with the external connection, this is the error:
  <a href="https://i.stack.imgur.com/DIn1F.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/DIn1F.png" alt="enter image description here"></a></p>
  
  <p>Here the line of error in package: <a href="https://github.com/yajra/laravel-oci8/blob/5.8/src/Oci8/Connectors/OracleConnector.php#L35" rel="nofollow noreferrer">https://github.com/yajra/laravel-oci8/blob/5.8/src/Oci8/Connectors/OracleConnector.php#L35</a></p>
  
  <h3>System details</h3>
  
  <ul>
  <li>Operating System: <code>macOS Mojave Version 10.14.4 (18E226)</code></li>
  <li>PHP Version: <code>7.3</code></li>
  <li>Laravel Version: <code>5.8.*</code></li>
  <li>Laravel-OCI8 Version: <code>5.8.*</code></li>
  </ul>
  
  <p>Anyone can help me please? </p>