docs: Update README.md

README.md

@@ -13,8 +13,7 @@
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-[![Subscribe to Newsletter](https://img.shields.io/badge/newsletter-subscribe-yellow.svg?style=flat&logo=mailchimp&logoColor=white)](https://blog.js.wiki/subscribe)  
+[![Open Collective backers and sponsors](https://img.shields.io/opencollective/all/wikijs?label=backers&color=218bff&logo=opencollective&logoColor=white)](https://opencollective.com/wikijs)  
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