Update README.md

Author: swooningfish

README.md

@@ -86,6 +86,7 @@ return DataTables::make(User::all())->toJson();
 | 9.x     | 10.x     |
 | 10.x    | 10.x     |
 | 11.x    | 11.x     |
+| 12.x    | 12.x     |
 
 ## Quick Installation