Update README.md

Author: app-generator

README.md

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+## 🚀 `PROMO` [Spring Boost Campaign](https://appseed.us/discounts/) `50%OFF`
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+> The **discount is applicable to all products and licenses** (no stock limits) until `15.MAR`
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+[![Spring Boost Campaign](https://user-images.githubusercontent.com/51070104/221118889-171c5afc-4d01-402b-8681-61b37338e26c.png)](https://appseed.us/discounts/)
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 ## ✨ [Django Berry Dashboard](https://appseed.us/product/berry-dashboard/django/)
 
 Open-source **Django** project crafted on top of **Berry Dashboard**, an open-source `Boostrap 5` design from [CodedThemes](https://codedthemes.com/?ref=appseed)