Docs/licence year update (#8671)

* Update license year

* Update docusaurus.config.js

update license year

* Update LICENSE.md

Author: LeeLenaleee

LICENSE.md

@@ -1,6 +1,6 @@
 The MIT License (MIT)
 
-Copyright (c) 2018 Chart.js Contributors
+Copyright (c) 2014-2021 Chart.js Contributors
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 

docs/docusaurus.config.js

@@ -78,7 +78,7 @@ module.exports = {
           ],
         },
       ],
-      copyright: `Copyright © ${new Date().getFullYear()} Chart.js contributors.`,
+      copyright: `Copyright © 2014-${new Date().getFullYear()} Chart.js contributors.`,
     },
   },
   presets: [