Merge pull request #375 from JRF63/ftw-chgrp-fix

Add missing chgrp module in tree-tests.rs

Author: jgarzik

tree/tests/tree-tests.rs

@@ -7,6 +7,7 @@
 // SPDX-License-Identifier: MIT
 //
 
+mod chgrp;
 mod cp;
 mod link;
 mod ls;