chore: export error as wildcard

Author: zhengzheng-jason

src/index.ts

@@ -2,4 +2,4 @@ export * as ReferralExchange from "./api";
 export { ReferralExchangeClient } from "./Client";
 export { ReferralExchangeJwtClient } from "./wrapper/ReferralExchangeJwtClient";
 export { ReferralExchangeEnvironment } from "./environments";
-export { ReferralExchangeError, ReferralExchangeTimeoutError } from "./errors";
+export * from "./errors";