iceraven-browser/.github/PULL_REQUEST_TEMPLATE

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<!-- Text above this line will be added to the commit once "bors" merges this PR -->

### Pull Request checklist
<!-- Before submitting the PR, please address each item -->
- [ ] **Quality**: This PR builds and passes detekt/ktlint checks (A pre-push hook is recommended)
- [ ] **Tests**: This PR includes thorough tests or an explanation of why it does not
- [ ] **Screenshots**: This PR includes screenshots or GIFs of the changes made or an explanation of why it does not
- [ ] **Accessibility**: The code in this PR follows [accessibility best practices](https://github.com/mozilla-mobile/shared-docs/blob/master/android/accessibility_guide.md) or does not include any user facing features

### After merge
- [ ] **Milestone**: Make sure issues finished by this pull request are added to the [milestone](https://github.com/mozilla-mobile/fenix/milestones) of the version currently in development.

### To download an APK when reviewing a PR:
1. click on Show All Checks,
2. click Details next to "Taskcluster (pull_request)" after it appears and then finishes with a green checkmark,
3. click on the "Fenix - assemble" task, then click "Run Artifacts".
4. the APK links should be on the left side of the screen, named for each CPU architecture