Update casino.py
Update casino.py

- Added double down for blackjack. Type double on the first bet to double your bet.
- Fixed exchange rate to properly work with floats. Example: if exchange set to 0.45, the ratio will be 9:20, and will require the person to use multiples of 20.

- Fixed some issues with blackjack incorrectly giving the player a push
- Fixed the casino info showing allin info for blackjack and vice versa
- Changed leaderboard output table type
- Added ratios to the exchange table instead of multiplier in casino info
OldManMarsh/Jumper-Cogs