Please add explanation in doc as to why INCLUDE+ was rejected

[noamzilo]

Please add explanation in doc as to why INCLUDE+ was rejected.

Was it even rejected?

I worry using this if there are drawbacks or open discussions regarding this. It seems so trivial, but I am a newbie to docker.

[aminya]

moby/moby#735

[fjf2002]

Try https://github.com/devthefuture-org/dockerfile-x . Seems to be maintained as opposed to tis project.