code: function highlight(code) {
    return new Promise((resolve, reject) => {
      pygmentize({ lang: 'html', format: 'html' }, code, function (err, result) {
        if (err) {
          console.log(err);
          reject(err);
        } else {
          resolve(result.toString());
        };
      });
    });
  }
docs: Syntax highlights a string.