Fixed accidentally removed status code in app/check.php
merged branch maxromanovsky/app-config-status-code-fix (PR #553)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #553).

Discussion
----------

Fixed accidentally removed status code in app/check.php

Commits
-------

bbf5680 Fixed accidentally removed status code in app/check.php
updated VENDORS for 2.3.0