Merge remote-tracking branch 'origin/P5' into P5

# Conflicts:
#	src/main/java/bank/PrivateBank.java

src/main/java/bank/PrivateBank.java

@@ -354,6 +354,7 @@ public class PrivateBank implements Bank, JsonSerializer<Transaction>, JsonDeser
      */
     @Override
     public List<Transaction> getTransactionsByType(String account, boolean positive) {
+        // an der Kopie der Liste Arbeiten oder nur Filtern und nicht entfernen
         List<Transaction> transactions = new ArrayList<>(this.accountsToTransactions.get(account));
         if (positive)
             transactions.removeIf(transaction -> transaction.calculate() >= 0);