HW10: Fixed animation problem (miracle...)

1. Previously when the player makes the move, the state won't be updated
until the ai makes the move... so the state updates two times at
once.... Now I added a timer to delay the ai and it worked... Though
there's still no animation for the AI. But everything is better now...

2. AI response time is increased to 1.75s (Since there's 1s animation,
so in my opinion it's not too long...) And the AI is good :) Though luck
is the most import thing in this game, but the AI will always makes a
good move.