code: function buildInquirerChoices(cards) {
    return cards.sources.map(source => {
      const _default =
        source.id === cards.defaultSource ? ` ${chalk.bold('(default)')}` : '';
      const id = `${chalk.cyan(`ID: ${source.id}`)}${_default}`;
      const number = `${chalk.gray('#### ').repeat(3)}${source.last4 ||
        source.card.last4}`;
      const str = [
        id,
        indent(source.name || source.owner.name, 2),
        indent(`${source.brand || source.card.brand} ${number}`, 2)
      ].join('\n');
  
      return {
        name: str, // Will be displayed by Inquirer
        value: source.id, // Will be used to identify the answer
        short: source.id // Will be displayed after the users answers
      };
    });
  }
docs: Builds a `choices` object that can be passesd to inquirer.prompt()