electron/.github/PULL_REQUEST_TEMPLATE.md

#### Description of Change
<!--
Thank you for your Pull Request. Please provide a description above and review
the requirements below.

Contributors guide: https://github.com/electron/electron/blob/master/CONTRIBUTING.md
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#### Checklist
<!-- Remove items that do not apply. For completed items, change [ ] to [x]. -->

- [ ] PR description included and stakeholders cc'd
- [ ] `npm test` passes
- [ ] tests are [changed or added](https://github.com/electron/electron/blob/master/docs/development/testing.md)
- [ ] relevant documentation is changed or added
- [ ] PR title follows semantic [commit guidelines](https://github.com/electron/electron/blob/master/docs/development/pull-requests.md#commit-message-guidelines)
- [ ] [PR release notes](https://github.com/electron/clerk/blob/master/README.md) describe the change in a way relevant to app developers, and are [capitalized, punctuated, and past tense](https://github.com/electron/clerk/blob/master/README.md#examples).


#### Release Notes

Notes: <!-- Please add a one-line description for app developers to read in the release notes, or `no-notes` if no notes relevant to app developers. Examples and help on special cases: https://github.com/electron/clerk/blob/master/README.md#examples -->