vm: Update copyright and authors in object.c
*
* Virtual memory manager - object management
*
- * Copyright 2017 Phoenix Systems
- * Author: Pawel Pisarczyk, Jan Sikorski
+ * Copyright 2017, 2020 Phoenix Systems
+ * Author: Pawel Pisarczyk, Jan Sikorski, Maciej Purski
*
* This file is part of Phoenix-RTOS.
*
