code: function getPublicIp() {
    return new Promise((resolve, reject) => {
      const options = {
        host: 'api.ipify.org',
        port: 80,
        path: '/',
      };
      http
        .get(options, res => {
          res.setEncoding('utf8');
  
          let body = '';
          res.on('data', chunk => {
            body += chunk;
          });
  
          res.on('end', () => {
            resolve(body);
          });
        })
        .on('error', err => {
          reject(err);
        });
    });
  }
docs: Return the public IP
  
  @return {Promise}