Update LICENSE

KEINOS · web-flow · commit fb27265990ce · 2023-02-19T09:56:26.000+09:00
diff --git a/LICENSE b/LICENSE
@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2018 KEINOS
+Copyright (c) 2023 KEINOS and the contributors <https://github.com/KEINOS/parsedown-extension_table-of-contents/graphs/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
