refactoring package 'dto' to 'model'

src/main/java/org/gcube/app/springbootangulardemo/controller/GreetingRestController.java

@@ -2,7 +2,7 @@ package org.gcube.app.springbootangulardemo.controller;
 
 import java.util.concurrent.atomic.AtomicLong;
 
-import org.gcube.app.springbootangulardemo.dto.Greeting;
+import org.gcube.app.springbootangulardemo.model.Greeting;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;

src/main/java/org/gcube/app/springbootangulardemo/model/Greeting.java

@@ -1,4 +1,4 @@
-package org.gcube.app.springbootangulardemo.dto;
+package org.gcube.app.springbootangulardemo.model;
 
 import java.util.Objects;