Fix [UnusedImport] in StudentDomain

spring-integration-jpa/src/test/java/org/springframework/integration/jpa/test/entity/StudentDomain.java

@@ -21,7 +21,6 @@ import java.util.Date;
 import javax.persistence.Column;
 import javax.persistence.Entity;
 import javax.persistence.GeneratedValue;
-import javax.persistence.GenerationType;
 import javax.persistence.Id;
 import javax.persistence.NamedNativeQuery;
 import javax.persistence.NamedQueries;
@@ -37,6 +36,7 @@ import javax.persistence.TemporalType;
  *
  * @author Amol Nayak
  * @author Gunnar Hillert
+ * @author Artem Bilan
  *
  * @since 2.2
  *