prettier/.github/PULL_REQUEST_TEMPLATE.md

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- [ ] I’ve added tests to confirm my change works.
- [ ] (If changing the API or CLI) I’ve documented the changes I’ve made (in the `docs/` directory)
- [ ] (If the change is user-facing) I’ve added my changes to the `CHANGELOG.unreleased.md` file following the template.
- [ ] I’ve read the [contributing guidelines](https://github.com/prettier/prettier/blob/master/CONTRIBUTING.md).

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