generic/.github/PULL_REQUEST_TEMPLATE.md

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### PR Checklist
Please check if your PR fulfills the following requirements:

- [ ] I have read, and am following the [Contributor guide](https://github.com/gaphor/generic/blob/main/CONTRIBUTING.md)
- [ ] I have read and understand the [Code of Conduct](https://github.com/gaphor/generic/blob/main/CODE_OF_CONDUCT.md)

### PR Type
What kind of change does this PR introduce?

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- [ ] Bugfix
- [ ] Feature
- [ ] Code style update (formatting, local variables)
- [ ] Refactoring (no functional changes, no api changes)
- [ ] Documentation content changes

### What is the current behavior?
<!-- Please describe the current behavior that you are modifying, or link to a relevant issue. -->

Issue Number: N/A

### What is the new behavior?

### Does this PR introduce a breaking change?
- [ ] Yes
- [ ] No

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### Other information