feat(connext): add USDT pairs to mainnet

Author: Karl Ranna

Diff for: lib/db/seeds/mainnet.ts

@@ -32,11 +32,19 @@ const currencies = [
     decimalPlaces: 18,
     tokenAddress: '0x0000000000000000000000000000000000000000',
   },
+  {
+    id: 'USDT',
+    swapClient: SwapClientType.Connext,
+    decimalPlaces: 6,
+    tokenAddress: '0xdac17f958d2ee523a2206206994597c13d831ec7',
+  },
 ] as db.CurrencyAttributes[];
 
 const pairs = [
-  { baseCurrency: 'LTC', quoteCurrency: 'BTC' },
   { baseCurrency: 'ETH', quoteCurrency: 'BTC' },
+  { baseCurrency: 'LTC', quoteCurrency: 'BTC' },
+  { baseCurrency: 'LTC', quoteCurrency: 'USDT' },
+  { baseCurrency: 'BTC', quoteCurrency: 'USDT' },
 ] as db.PairAttributes[];
 
 export {