[style] Fix licence header
/*
- * Copyright (c) 2018, 2019, APT Group, School of Computer Science,
+ * Copyright (c) 2018, 2019, 2020 APT Group, Department of Computer Science,
* The University of Manchester. All rights reserved.
* Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
