PR template: remind people to run `cargo fmt` and `cargo clippy`

.github/pull_request_template.md

@@ -3,9 +3,10 @@ Please read the "Making a PR" section of [`CONTRIBUTING.md`](https://github.com/
 
 * Keep your PR:s small and focused.
 * If applicable, add a screenshot or gif.
-* Open the PR as a draft until you have self-reviewed it and it is green.
-* If it is a noteworthy change, add a line to the relevant `CHANGELOG.md` under "Unreleased".
+* Unless this is a trivial change, add a line to the relevant `CHANGELOG.md` under "Unreleased".
 * If it is a non-trivial addition, consider adding a demo for it to `egui_demo_lib`.
+* Remember to run `cargo fmt` and `cargo clippy`.
+* Open the PR as a draft until you have self-reviewed it and it is green.
 * When you have addressed a PR comment, mark it as resolved.
 
 Please be patient! I will review you PR, but my time is limited!