chore: update copyright year in docs and license file

Signed-off-by: Christopher Arndt <[email protected]>

Author: SpotlightKid

LICENSE.md

@@ -1,11 +1,11 @@
 Copyright & License
 ===================
 
-python-rtmidi was written by Christopher Arndt, 2012 - 2021.
+python-rtmidi was written by Christopher Arndt, 2012 - 2023.
 
 The software is released unter the MIT License:
 
-Copyright (c) 2012 - 2022 Christopher Arndt
+Copyright (c) 2012 - 2023 Christopher Arndt
 
     Permission is hereby granted, free of charge, to any person obtaining a
     copy of this software and associated documentation files (the "Software"),

docs/conf.py

@@ -60,7 +60,7 @@
 # General information about the project.
 project = 'python-rtmidi'
 author = 'Christopher Arndt'
-copyright = f'2012 - 2022, {author}'
+copyright = f'2012 - 2023, {author}'
 
 # The version info for the project you're documenting, acts as replacement
 # for |version| and |release|, also used in various other places throughout