SGF-813 - Update copyright years to 2019.

samples/hello-world/src/main/java/org/springframework/data/gemfire/samples/helloworld/CacheLogger.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 the original author or authors.
+ * Copyright 2010-2019 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.

samples/hello-world/src/main/java/org/springframework/data/gemfire/samples/helloworld/CommandProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 the original author or authors.
+ * Copyright 2010-2019 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.

samples/hello-world/src/main/java/org/springframework/data/gemfire/samples/helloworld/HelloWorld.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 the original author or authors.
+ * Copyright 2010-2019 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.

samples/hello-world/src/main/java/org/springframework/data/gemfire/samples/helloworld/Main.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 the original author or authors.
+ * Copyright 2010-2019 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.

samples/hello-world/src/test/java/org/springframework/data/gemfire/samples/helloworld/BasicTest.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010 the original author or authors.
+ * Copyright 2010-2019 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.