Update PULL_REQUEST_TEMPLATE.md to include linting (Significant-Gravi…

…tas#3625)

Co-authored-by: Nicholas Tindle <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -35,7 +35,8 @@ By following these guidelines, your PRs are more likely to be merged quickly aft
 - [ ] I have thoroughly tested my changes with multiple different prompts.
 - [ ] I have considered potential risks and mitigations for my changes.
 - [ ] I have documented my changes clearly and comprehensively.
-- [ ] I have not snuck in any "extra" small tweaks changes <!-- Submit these as separate Pull Requests, they are the easiest to merge! -->
+- [ ] I have not snuck in any "extra" small tweaks changes. <!-- Submit these as separate Pull Requests, they are the easiest to merge! -->
+- [ ] I have run `black .` and `isort .` against my code to ensure it passes our linter.
 
 <!-- If you haven't added tests, please explain why. If you have, check the appropriate box. If you've ensured your PR is atomic and well-documented, check the corresponding boxes. -->