feature: add bybit demo trading option to readme command reference (#647)

Author: Romazes

README.md

@@ -471,7 +471,7 @@ Options:
   --bybit-api-secret TEXT         Your Bybit API secret
   --bybit-vip-level [VIP0|VIP1|VIP2|VIP3|VIP4|VIP5|SupremeVIP|Pro1|Pro2|Pro3|Pro4|Pro5]
                                   Your Bybit VIP Level
-  --bybit-use-testnet [live|paper]
+  --bybit-use-testnet [live|paper|demo]
                                   Whether the testnet should be used
   --trade-station-environment [live|paper]
                                   Whether Live or Paper environment should be used
@@ -1458,7 +1458,7 @@ Options:
   --bybit-api-secret TEXT         Your Bybit API secret
   --bybit-vip-level [VIP0|VIP1|VIP2|VIP3|VIP4|VIP5|SupremeVIP|Pro1|Pro2|Pro3|Pro4|Pro5]
                                   Your Bybit VIP Level
-  --bybit-use-testnet [live|paper]
+  --bybit-use-testnet [live|paper|demo]
                                   Whether the testnet should be used
   --trade-station-environment [live|paper]
                                   Whether Live or Paper environment should be used