update file headers

Author: zsquareplusc

parallel/__init__.py

@@ -2,7 +2,8 @@
 # this is a wrapper module for different platform implementations
 #
 # (C)2001-2002 Chris Liechti <[email protected]>
-# this is distributed under a free software license, see license.txt
+#
+# SPDX-License-Identifier:    BSD-3-Clause
 
 import os
 VERSION = "0.3"

parallel/parallelutil.py

@@ -1,3 +1,9 @@
+#!/bin/env python
+#
+# (C) 2002 Chris Liechti <[email protected]>
+#
+# SPDX-License-Identifier:    BSD-3-Clause
+
 class BitaccessMeta(type):
     """meta class that adds bit access properties to a
     parallel port implementation"""

parallel/parallelwin32.py

@@ -2,7 +2,8 @@
 # see __init__.py
 #
 # (C) 2002 Chris Liechti <[email protected]>
-# this is distributed under a free software license, see license.txt
+#
+# SPDX-License-Identifier:    BSD-3-Clause
 #
 # thanks to Dincer Aydin [email protected] for his work on the
 # winioport module: www.geocities.com/dinceraydin/ the graphic below is