message: docs: fix the Rebilly link
diff: @@ -64,7 +64,7 @@ Additionally, all the 1.x releases are hosted on our GitHub Pages-based CDN **(d
  | 1.17.x | 2.0 |
  ## Some Real-life usages
  -- [Rebilly](https://rebilly-api.redoc.ly/)
  +- [Rebilly](https://api-reference.rebilly.com/)
  - [Docker Engine](https://docs.docker.com/engine/api/v1.25/)
  - [Zuora](https://www.zuora.com/developer/api-reference/)
  - [Discourse](http://docs.discourse.org)
  