Update PULL_REQUEST_TEMPLATE.md

Ditch the checkboxes. The workflow covers the most important part and adding tests and documentation shouldn't be required. Just encouraged.

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,10 +4,10 @@ Thank you for submitting a PR to Ulauncher!
 Please read our contribution instructions if you haven't:
 https://github.com/Ulauncher/Ulauncher#code-contribution
 
-Explain the changes in this PR and link to related issue(s) if applicable
--->
+* Explain the changes in this PR and link to related issue(s) if applicable
+* When applicable, please update the documentation according to your changes.
+* Ensure that the PR doesn't break existing tests, and please add your own if applicable.
+
+A git action will verify your PR, but you can also test locally with `./ul test`
 
-### Checklist
-- [ ] Verify that the test command `./ul test` is passing (the CI server will check this if you don't)
-- [ ] Update the documentation according to your changes (when applicable)
-- [ ] Write unit tests for your changes (when applicable)
+-->