Number of digits allowed by default

[ellenaua]

When we have these two inputs on the page

<gold-cc-input auto-validate card-type="{{cardType}}"></gold-cc-input>
<gold-cc-cvc-input card-type="[[cardType]]"></gold-cc-cvc-input>

user sometimes wants to start typing from second one. But that allows only 3 digits by default (when cardType is unknown). Maybe it makes sense to allow both 3 and 4 symbols when cardType is undefined yet?

[notwaldorf]

Yeah, that makes sense! Would you be interested in sending a PR and an unit test to add this feature?

[ellenaua]

@notwaldorf PR is here #47 but please check if that's ok