Update pull_request_template.md (#65)

* Update pull_request_template.md

* Update .github/PULL_REQUEST_TEMPLATE/pull_request_template.md

Co-authored-by: Alex Vanyo <vanyo@google.com>

Co-authored-by: Alex Vanyo <vanyo@google.com>

.github/PULL_REQUEST_TEMPLATE/pull_request_template.md

@@ -3,9 +3,14 @@ name: Pull request
 about: Create a pull request
 label: 'triage me'
 ---
-Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
+Thank you for opening a Pull Request!
+Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
 - [ ] Make sure to open a GitHub issue as a bug/feature request before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
-- [ ] Ensure the tests and linter pass
+- [ ] Ensure the tests and linter pass (`./gradlew spotlessApply` to automatically apply formatting)
 - [ ] Appropriate docs were updated (if necessary)
 
+Is this your first Pull Request?
+- [ ] Run `./tools/setup.sh`
+- [ ] Import the code formatting style as explained in [the setup script](/tools/setup.sh#L40).
+
 Fixes #<issue_number_goes_here> 🦕