Successful OPTIONS requests are aborted

[Setheck]

I'm not sure why but this library aborts successful options requests ->

cors/config.go

Line 92 in 90bd363

defer c.AbortWithStatus(cors.optionsResponseStatusCode)

According to GIN godoc abort prevents handlers from running. this seems like an error to me.

This means that when using the lib, middleware on OPTIONS requests following this can never work.

[SayakMukhopadhyay]

It aborts the Options request with a 204 response, which I believe is the right thing to do, as once the pre-flight request is verified, that request no longer needs to be used elsewhere.