Update README.md

README.md

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 - 🧵 optionally auto-map OpenAPI endpoints to Express handler functions
 - ✂️ **\$ref** support; split specs over multiple files
 - 🎈 file upload
+- ✏️ OpenAPI 3.0.x and 3.1.x spec support
 
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 **Docs:**
 - 📖 [documentation](https://cdimascio.github.io/express-openapi-validator-documentation/)
 
@@ -29,7 +31,7 @@
 [NestJS](https://github.com/cdimascio/express-openapi-validator/tree/master/examples/9-nestjs)
 [Koa](https://github.com/cdimascio/express-openapi-validator/tree/lerna-fastify/packages/koa-openapi-validator) and [Fastify](https://github.com/cdimascio/express-openapi-validator/tree/lerna-fastify/packages/fastify-openapi-validator) now available! 🚀
 
-[OAS 3.1 (beta)](https://github.com/cdimascio/express-openapi-validator/pull/882) is available in v5.4.0!
+
 
 ## Install