added oas annotation

Author: danielkocot

src/main/java/de/codecentric/apifirstspringboot/controller/NewsController.java

@@ -7,9 +7,11 @@
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import springfox.documentation.oas.annotations.EnableOpenApi;
 
 import java.util.List;
 
+@EnableOpenApi
 @RequestMapping("/api")
 @Controller
 public class NewsController {