exact same code from iris cors middleware

[WLun001]

Correct me if I am wrong. I found out iris cors middleware is almost 100% identical to rs/cors.

https://github.com/iris-contrib/middleware/blob/v12/cors/cors.go
with
https://github.com/rs/cors/blob/master/cors.go

[rs]

They copied the code and kept our license. Nothing wrong here.