Updated copyright year (#2189)

Happy new year!

Author: jnns

mkdocs.yml

@@ -33,7 +33,7 @@ repo_url: https://github.com/squidfunk/mkdocs-material
 edit_uri: ""
 
 # Copyright
-copyright: Copyright © 2016 - 2020 Martin Donath
+copyright: Copyright © 2016 - 2021 Martin Donath
 
 # Configuration
 theme: