Reformat code

spring-boot-samples/spring-boot-sample-data-mongodb/src/main/java/sample/data/mongo/Customer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2013 the original author or authors.
+ * Copyright 2012-2018 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ public class Customer {
 	private String id;
 
 	private String firstName;
+
 	private String lastName;
 
 	public Customer() {