use npm-run-script in PULL_REQUEST_TEMPLATE (facebook#7913)

Author: koba04

.github/PULL_REQUEST_TEMPLATE.md

@@ -3,6 +3,6 @@
 1. Fork the repo and create your branch from `master`.
 2. If you've added code that should be tested, add tests!
 3. If you've changed APIs, update the documentation.
-4. Ensure the test suite passes (`grunt test`).
-5. Make sure your code lints (`grunt lint`) - we've done our best to make sure these rules match our internal linting guidelines.
+4. Ensure the test suite passes (`npm test`).
+5. Make sure your code lints (`npm run lint`) - we've done our best to make sure these rules match our internal linting guidelines.
 6. If you haven't already, complete the [CLA](https://code.facebook.com/cla).