feat: add Goa to README (#261)

Goa v3 depend on kin-openapi

https://github.com/goadesign/goa/blob/v3/go.mod

README.md

@@ -17,6 +17,7 @@ Here's some projects that depend on _kin-openapi_:
   * [github.com/deepmap/oapi-codegen](https://github.com/deepmap/oapi-codegen) - Generate Go server boilerplate from an OpenAPI 3 spec
   * [github.com/dunglas/vulcain](https://github.com/dunglas/vulcain) - "Use HTTP/2 Server Push to create fast and idiomatic client-driven REST APIs"
   * [github.com/danielgtaylor/restish](https://github.com/danielgtaylor/restish) - "...a CLI for interacting with REST-ish HTTP APIs with some nice features built-in"
+  * [github.com/goadesign/goa](https://github.com/goadesign/goa) - "Goa is a framework for building micro-services and APIs in Go using a unique design-first approach."
   * (Feel free to add your project by [creating an issue](https://github.com/getkin/kin-openapi/issues/new) or a pull request)
 
 ## Alternative projects