Make sure 'testOutput' directory exists before accessing it.

Author: alerosmile

example/src/main/java/org/linguafranca/pwdb/kdbx/QuickStart.java

@@ -84,6 +84,7 @@ public void saveKdbx() throws IOException {
  }
 
  // save to a file with password "123"
+ new File("testOutput").mkdirs();
  try (FileOutputStream outputStream = new FileOutputStream("testOutput/test.kdbx")) {
  database.save(new KdbxCreds("123".getBytes()), outputStream);
  }