Adding duck functionality

[b-x-wu]

Hi! I was looking through the code, and I realized that there's no way for the dino to duck during the game. There's a duck method for the DinoAgent class, but there's nothing in the Game class to support it.

I added in the functionality, and I was wondering if I could make a pull request.

[mofengboy]

Hi! I was looking through the code, and I realized that there's no way for the dino to duck during the game. There's a duck method for the DinoAgent class, but there's nothing in the Game class to support it.

I added in the functionality, and I was wondering if I could make a pull request.

How is the duck method implemented, please? I tried send_keys(Keys.DOWN) and keep_down(Keys.DOWN) without success.

[ravi72munde]

It was intentionally removed to reduce the training time and complexity.