README and docs: update years

Author: stanislaw

README.md

@@ -25,6 +25,7 @@ Documentation is hosted on Read the Docs:
 
 ## Copyright
 
-Copyright (c) 2021 Stanislav Pankevich s.pankevich@gmail.com. See LICENSE for
+Copyright (c) 2019-2023 Stanislav Pankevich s.pankevich@gmail.com. See
+LICENSE for
 details.
 

docs/conf.py

@@ -19,7 +19,7 @@
 # -- Project information -----------------------------------------------------
 
 project = "FileCheck.py"
-copyright = "2019, Stanislav Pankevich"
+copyright = "2019-2023, Stanislav Pankevich"
 author = "Stanislav Pankevich"
 
 # The full version, including alpha/beta/rc tags