Merge pull request #23571 from mnhock

* pr/23571:
  Update copyright of changed file
  Use platform-independent line separator

Closes gh-23571

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/java/TestFormatter.java

 /*
- * Copyright 2012-2019 the original author or authors.
+ * Copyright 2012-2020 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.
@@ -28,7 +28,7 @@ public class TestFormatter extends Formatter {
 
 	@Override
 	public String format(LogRecord record) {
-		return String.format("foo: %s -- %s\n", record.getLoggerName(), record.getMessage());
+		return String.format("foo: %s -- %s%n", record.getLoggerName(), record.getMessage());
 	}
 
 }