feat: expose instrument isin in portfolio positions

src/tbank/tbank.client.ts

@@ -44,7 +44,7 @@ export type TbankPortfolio = {
   }[];
 };
 export type TbankPositions = { money?: TbankMoney[] };
-export type TbankInstrument = { ticker?: string; name?: string };
+export type TbankInstrument = { ticker?: string; name?: string; isin?: string };
 export type TbankTimestamp = { seconds?: string | number; nanos?: number };
 export type TbankOperationItem = {
   cursor?: string;