docs: function _main(args) {
    triggerWebhook(...args).
      then(({statusCode, responseText}) => (200 <= statusCode && statusCode < 400) ?
        console.log(`Status: ${statusCode}\n${responseText}`) :
        Promise.reject(new Error(`Request failed (status: ${statusCode}): ${responseText}`))).
      catch(err => {
        console.error(err);
        process.exit(1);
      });
  }