Polishing

spring-messaging/src/main/java/org/springframework/messaging/support/AbstractHeaderMapper.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2018 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.
@@ -25,7 +25,7 @@ import org.springframework.messaging.MessageHeaders;
 import org.springframework.util.StringUtils;
 
 /**
- * A base {@link HeaderMapper} implementation
+ * A base {@link HeaderMapper} implementation.
  *
  * @author Stephane Nicoll
  * @since 4.1