Explain how to use the `close()` method of the `readline.Interface` object.

The `close()` method of the `readline.Interface` object is used to terminate the `readline` reader. Calling `close()` will emit the `close` event. It's important to call `close()` when you're finished reading input to release resources and prevent memory leaks. You can also provide a callback function to the `close()` method to execute after the reader is closed.