Added gin-hydra as an external middleware

README.md

@@ -26,3 +26,4 @@ Each author is responsible of maintaining his own code, although if you submit a
 + [gin-location](https://github.com/drone/gin-location) - middleware for exposing the server's hostname and scheme
 + [gin-nice-recovery](https://github.com/ekyoung/gin-nice-recovery) - panic recovery middleware that let's you build a nicer user experience
 + [gin-limit](https://github.com/aviddiviner/gin-limit) - limits simultaneous requests; can help with high traffic load
++ [gin-hydra](https://github.com/janekolszak/gin-hydra) - [Hydra](https://github.com/ory-am/hydra) middleware for Gin