code: async function getPrFiles(mrNo) {
    logger.debug({ mrNo }, 'getPrFiles');
    if (!mrNo) {
      return [];
    }
    const files = (await get(
      `projects/${config.repository}/merge_requests/${mrNo}/changes`
    )).body.changes;
    return files.map(f => f.new_path);
  }
docs: Return a list of all modified files in a PR