Fix whitespace

Issue gh-1946

spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/Application.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample;
 
 import org.springframework.boot.SpringApplication;

spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/config/SessionConfig.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.config;
 
 import com.fasterxml.jackson.databind.ObjectMapper;

spring-session-samples/spring-session-sample-boot-redis-json/src/main/java/sample/web/HomeController.java

@@ -13,6 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
 package sample.web;
 
 import javax.servlet.http.HttpServletRequest;