message: Update README.md
  fix discourse URL.
diff: @@ -48,7 +48,7 @@ We host the latest and all the previous ReDoc releases on GitHub Pages-based **C
  - [Docker Engine](https://docs.docker.com/engine/api/v1.25/)
  - [Zuora](https://www.zuora.com/developer/api-reference/)
  - [Shopify Draft Orders](https://help.shopify.com/api/draft-orders)
  -- [Discourse](https://docs.discourse.org)
  +- [Discourse](http://docs.discourse.org)
  - [APIs.guru](https://apis.guru/api-doc/)
  ## Deployment
  