docs: update copyright, notes, changelog
diff --git a/serial/__init__.py b/serial/__init__.py
index afd63a6..6160c8b 100644
--- a/serial/__init__.py
+++ b/serial/__init__.py
@@ -3,7 +3,7 @@
 # This is a wrapper module for different platform implementations
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
-# (C) 2001-2017 Chris Liechti <cliechti@gmx.net>
+# (C) 2001-2020 Chris Liechti <cliechti@gmx.net>
 #
 # SPDX-License-Identifier:    BSD-3-Clause
 
diff --git a/serial/serialposix.py b/serial/serialposix.py
index 2f125c3..51e6a10 100644
--- a/serial/serialposix.py
+++ b/serial/serialposix.py
@@ -3,7 +3,7 @@
 # backend for serial IO for POSIX compatible systems, like Linux, OSX
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
-# (C) 2001-2016 Chris Liechti <cliechti@gmx.net>
+# (C) 2001-2020 Chris Liechti <cliechti@gmx.net>
 #
 # SPDX-License-Identifier:    BSD-3-Clause
 #
diff --git a/serial/serialutil.py b/serial/serialutil.py
index 8c5ccfe..789219e 100644
--- a/serial/serialutil.py
+++ b/serial/serialutil.py
@@ -3,7 +3,7 @@
 # Base class and support functions used by various backends.
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
-# (C) 2001-2016 Chris Liechti <cliechti@gmx.net>
+# (C) 2001-2020 Chris Liechti <cliechti@gmx.net>
 #
 # SPDX-License-Identifier:    BSD-3-Clause
 
diff --git a/serial/serialwin32.py b/serial/serialwin32.py
index 649a75f..e7da929 100644
--- a/serial/serialwin32.py
+++ b/serial/serialwin32.py
@@ -2,7 +2,7 @@
 #
 # backend for Windows ("win32" incl. 32/64 bit support)
 #
-# (C) 2001-2015 Chris Liechti <cliechti@gmx.net>
+# (C) 2001-2020 Chris Liechti <cliechti@gmx.net>
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
 # SPDX-License-Identifier:    BSD-3-Clause
diff --git a/serial/tools/list_ports_osx.py b/serial/tools/list_ports_osx.py
index 0c719db..0b73fa2 100644
--- a/serial/tools/list_ports_osx.py
+++ b/serial/tools/list_ports_osx.py
@@ -7,7 +7,7 @@
 # and modifications by cliechti, hoihu, hardkrash
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
-# (C) 2013-2015
+# (C) 2013-2020
 #
 # SPDX-License-Identifier:    BSD-3-Clause
 
diff --git a/serial/urlhandler/protocol_loop.py b/serial/urlhandler/protocol_loop.py
index 8ac8ddf..2aeebfc 100644
--- a/serial/urlhandler/protocol_loop.py
+++ b/serial/urlhandler/protocol_loop.py
@@ -6,7 +6,7 @@
 # and it was so easy to implement ;-)
 #
 # This file is part of pySerial. https://github.com/pyserial/pyserial
-# (C) 2001-2015 Chris Liechti <cliechti@gmx.net>
+# (C) 2001-2020 Chris Liechti <cliechti@gmx.net>
 #
 # SPDX-License-Identifier:    BSD-3-Clause
 #