Fix Spring Data compilation after Spring bump upstream

Author: rsvoboda

602-spring-data-rest/src/main/java/org/acme/spring/data/rest/BookRepository.java

@@ -5,12 +5,13 @@
 
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
+import org.springframework.data.repository.CrudRepository;
 import org.springframework.data.repository.PagingAndSortingRepository;
 import org.springframework.data.rest.core.annotation.RepositoryRestResource;
 import org.springframework.data.rest.core.annotation.RestResource;
 
 @RepositoryRestResource(exported = false, path = "books", collectionResourceRel = "books")
-public interface BookRepository extends PagingAndSortingRepository<Book, Long> {
+public interface BookRepository extends PagingAndSortingRepository<Book, Long>, CrudRepository<Book, Long> {
 
     @Override
     @RestResource(exported = true)