Pull request template: new tests not always needed

[ci skip]

.github/pull_request_template.md

@@ -6,7 +6,7 @@ Please describe your pull request. Thank you for contributing! You're the best.
 <!--- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
 - [ ] I have reviewed the [guidelines for contributing](../blob/master/CONTRIBUTING.md) to this repository.
 - [ ] I have added an entry to [History.md](../blob/master/History.md) if this PR fixes a bug or adds a feature. If it doesn't need an entry to HISTORY.md, I have added `[changelog skip]` or `[ci skip]` to the pull request title.
-- [ ] I have added appropriate tests if this PR fixes a bug or adds a feature.
+- [ ] I have added (or updated) appropriate tests if this PR fixes a bug or adds a feature.
 - [ ] My pull request is 100 lines added/removed or less so that it can be easily reviewed.
 - [ ] If this PR doesn't need tests (docs change), I added `[ci skip]` to the title of the PR.
 - [ ] If this closes any issues, I have added "Closes `#issue`" to the PR description or my commit messages.