Remove line to use in Browser

[jonalxh]

Hi, I've been using card-validator in a learning project and I've noticed that to use it in browser, with dist/validator.js is necessary to delete the last line in the file mentioned:

 module.exports = cardValidator;

Please check and update it.

Thanks.

[boazjohn]

@jonalxh bower itself is being phased out and they recommend alternatives like yarn or webpack. https://bower.io

I think for npm, yarn etc, this line is required.

[jonalxh]

Thanks.