Add payment command to filter payment status

src/main/java/seedu/address/logic/commands/FilterCommand.java

@@ -36,6 +36,7 @@ public CommandResult execute(Model model) throws CommandException {
                 String.format(MESSAGE_FILTER_ADDRESS_BOOK_SUCCESS + Messages.MESSAGE_PERSONS_LISTED_OVERVIEW,
                         model.getFilteredPersonList().size(), predicate.filterResult()));
     }
+
     @Override
     public boolean equals(Object other) {
         if (other == this) {