isCreditCardValid returns true after editing number to be incorrect

[mhousser]

After the form is correctly filled out, and isCreditCardValid correctly returns true, I'm able to click on the credit card number, erase a bunch of the numbers (thus rendering the number incorrect), focus on some other field on the screen, and have isCreditCardValid still return true (when, in fact, I had expected it to return false).

I'm working with Stripe, which went on to fail because the data in the CreditCardForm was actually invalid at that point.

[dbachelder]

good catch. fixed in 1.4.6