add new variable to parlayer vault

TIPs/TIP-129.md

@@ -20,7 +20,8 @@ Parlay vault contract that will be created establishes following:
 - Vault will have a cap of how much can be deposited into them and a utilization rate variable that controls how much of the funds can be utilized for trading  
 - Vault trades can only be made on markets where each underlying position has `skewImpactLimit` discount (only puts discounted positons on a parlay ticket)
 - Amount to be paid for each trade should not be greater than `maxTradeRate` % of trading allocation in current round
-- Vault cannot make same trade with specific markets on Parlay AMM twice
+- Vault cannot make same trade with specific markets on Parlay AMM twice  
+- TODO: Add a new variable that controls how many time can the same market be used on a parlay within one round
 
 Parlay Vault will have keeper bot that check if a trade can be made and execute those, but the trading itself is permissionless and can be called by any address.