add krakend to gin user list (#1658)

README.md

@@ -2000,3 +2000,4 @@ Awesome project lists using [Gin](https://github.com/gin-gonic/gin) web framewor
 * [gorush](https://github.com/appleboy/gorush): A push notification server written in Go.
 * [fnproject](https://github.com/fnproject/fn): The container native, cloud agnostic serverless platform.
 * [photoprism](https://github.com/photoprism/photoprism): Personal photo management powered by Go and Google TensorFlow.
+* [krakend](https://github.com/devopsfaith/krakend): Ultra performant API Gateway with middlewares.