doc: update header in tests
diff --git a/test/test_iolib.py b/test/test_iolib.py
index f5635f3..7f30a49 100644
--- a/test/test_iolib.py
+++ b/test/test_iolib.py
@@ -1,11 +1,9 @@
#! /usr/bin/env python
#
-# Python Serial Port Extension for Win32, Linux, BSD, Jython
-# see __init__.py
+# This file is part of pySerial - Cross platform serial port support for Python
+# (C) 2001-2015 Chris Liechti <cliechti@gmx.net>
#
-# (C) 2001-2009 Chris Liechti <cliechti@gmx.net>
-# this is distributed under a free software license, see license.txt
-
+# SPDX-License-Identifier: BSD-3-Clause
"""\
Some tests for the serial module.
Part of pyserial (http://pyserial.sf.net) (C)2001-2009 cliechti@gmx.net