update pr template

Signed-off-by: Max Jeblick <maximilianjeblick@gmail.com>

Author: maxjeblick

.github/PULL_REQUEST_TEMPLATE.md

@@ -6,10 +6,11 @@ Description of your PR. Fixes # (issue) (if applicable)
 
 Before submitting a PR, please make sure:
 
-- Tests are working (`make test`)
-- Code is formatted correctly (`make style`, on errors try fix with `make format`)
-- Copyright header is included
+- [ ] Tests are working (`make test`)
+- [ ] Code is formatted correctly (`make style`, on errors try fix with `make format`)
+- [ ] Copyright header is included
 - [ ] All commits are signed-off  using `git commit -s`
+
 - [ ] (new press) `mypress_press.py` is in the `presses` directory
 - [ ] (new press) `MyPress` is in `__init__.py` 
 - [ ] (new press) `README.md` is updated with a 1 liner about the new press in the Available presses section