simple-icons/.github/PULL_REQUEST_TEMPLATE.md

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**Issue:** closes #

**Popularity metric:**

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### Checklist

- [ ] I updated the JSON data in `_data/simple-icons.json`
- [ ] I optimized the icon with SVGO or SVGOMG
- [ ] The SVG `viewbox` is `0 0 24 24`

### Description

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Anything relevant, for example:
  - Why did you pick the hex value?
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