chore(license): add missing copyright notice

Nhahan · Nhahan · commit a8e0b1d9ea9d · 2026-03-15T14:48:09.000+09:00
diff --git a/LICENSE b/LICENSE
@@ -1,5 +1,7 @@
 MIT License
 
+Copyright (c) 2023 Nhahan
+
 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
