Add openapi-validator-middleware plugin to the ecosystem docs

docs/Ecosystem.md

@@ -140,5 +140,6 @@ Plugins maintained by the fastify team are listed under [Core](#core) while plug
 - [`fast-water`](https://github.com/tswayne/fast-water) A fastify plugin for waterline. Decorates fastify with waterline models.
 - [`fastify-webpack-hmr`](https://github.com/lependu/fastify-webpack-hmr) Webpack hot module reloading plugin for Fastify.
 - [`fastify-ws`](https://github.com/gj/fastify-ws) WebSocket integration for Fastify — with support for WebSocket lifecycle hooks instead of a single handler function. Built upon [ws](https://github.com/websockets/ws) and [uws](https://github.com/uNetworking/bindings/tree/master/nodejs).
-- [`k-fastify-gateway`](https://github.com/jkyberneees/fastify-gateway) API Gateway plugin for `fastify`, a low footprint implementation that uses the `fastify-reply-from` HTTP proxy library.
 - [`i18next-http-middleware`](https://github.com/i18next/i18next-http-middleware#fastify-usage) An [i18next](https://www.i18next.com) based i18n (internationalization) middleware to be used with Node.js web frameworks like express or `Fastify` and also for Deno.
+- [`k-fastify-gateway`](https://github.com/jkyberneees/fastify-gateway) API Gateway plugin for `fastify`, a low footprint implementation that uses the `fastify-reply-from` HTTP proxy library.
+- [`openapi-validator-middleware`](https://github.com/PayU/openapi-validator-middleware#fastify) Swagger and OpenAPI 3.0 spec-based request validation middleware that supports `fastify`.