Bug in isBlackJack() method in BlackJackHand.java

[LeonCai1]

in isBlackJack() method, the code only checks for Aces and face cards. 10 and Ace should also be valid blackjack. I think the return statement should be: return (first.isAce() && second.value()==10)||(first.value()==10&& second.isAce());