Update README.md

Author: admin-dashboards

README.md

@@ -6,7 +6,7 @@ A curated list with open-source **[React Dashboards](https://dev.to/sm0ke/react-
 
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+## 🎁 `PROMO`: [SeRanking](https://seranking.com/?ga=2230964&source=link) - `All-in-one SEO Software`
 
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