docs: fix a typo in LICENSE filename

Author: Lowkaze

.vscode/settings.json

@@ -10,7 +10,7 @@
     "CHANGELOG": true,
     "CODE_OF_CONDUCT": true,
     "CONTRIBUTING": true,
-    "LICENCE": true,
+    "LICENSE": true,
     ".lycheecache": true,
     "lychee-out.md": true
   },

LICENCE.md renamed to LICENSE.md

@@ -352,7 +352,7 @@ This project is available under a dual license:
 - ✅ Attribution required
 - ✅ Modifications and distributions allowed
 - ❌ Commercial use not permitted
-- [View MIT License Details](./LICENCE.md)
+- [View MIT License Details](./LICENSE.md)
 
 ### 2. Commercial License