Update README.md (#1033)

* Update README.md

* Update README.md

Author: cdimascio

README.md

@@ -20,6 +20,7 @@
 - 🧵 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
 
 _Express 5 support is in progress--a subset of functionality is working. Try it out and provide feedback!_
 
@@ -30,8 +31,8 @@ _Express 5 support is in progress--a subset of functionality is working. Try it
 
 [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`!
 
-[OAS 3.1 (beta)](https://github.com/cdimascio/express-openapi-validator/pull/882) is available in v5.4.0!
 
 ## Install