This project is now developed on https://www.drupal.org/project/distro_helper.

You can update your composer files to use drupal/distro_helper instead of thinkshout/distro_helper.

There's a handy branch for when we were running circle tests, detailing how to run unit tests locally: https://github.com/thinkshout/distro_helper/blob/testing-instructions/tests/README.md