update README.md

Author: aspeddro

README.md

@@ -9,7 +9,5 @@ Contributions are welcome. Here’s how you can help:
 🙂 Provide a minimal ReScript snippet which produces an `(ERROR)` node or otherwise incorrect syntax tree. Open a new issue providing this snippet and the resulting syntax tree. You can use the following command to see the syntax tree:
 
 ```bash
-yarn tree-sitter parse /path/to/your/snippet.res
+npm run parse path/to/file.res
 ```
-
-🤩 Add a failing test case for a snippet which is valid ReScript but produces an incorrect syntax tree. Fix the `grammar.js`. Make sure nothing is broken: `make test test_wild` shows 100% test success. Open a pull request.