Fix issue when updating portfolio

src/main/java/com/danielbohry/stocks/repository/StockRepository.java

@@ -79,7 +79,7 @@ public class StockRepository {
     public boolean isValid(String code) {
         Quote quote = repository.findByCode(code).stream().findFirst().orElse(null);
 
-        if (quote != null && "BRL".equals(quote.getCurrency())) return true;
+        if (quote != null) return true;
 
         try {
             log.info("Current stock's name is null. Requesting latest information...");