restic/.github/PULL_REQUEST_TEMPLATE.md

What changes are made in this PR? What problem does it solve?

Was the change previously discussed in an issue or on the forum?

Checklist

• I have read the contribution guidelines.
• I have enabled maintainer edits for this PR.
• I have added tests for all code changes in this PR.
• I have added documentation for the those changes (in the manual).
• There's a new file in changelog/unreleased/ that describes the changes for our users (see template).
• I have run gofmt on the code in all commits.
• All commit messages are formatted in the same style as the other commits in the repo.
• I'm done! This pull request is ready for review.