Error when using darwin goon in linux docker container could be clearer

[KronicDeth]

If you're using docker on OSX to run your Elixir project and you download the darwin version of goon, thinking you need the OSX version, you'll get

14:51:56.559 [info] Application porcelain exited: Porcelain.App.start(:normal, []) returned an error: "goon executable at /code/goon does not support protocol version 2.0"

But the actual problem is you needed to install the linux amd64 version of goon. I don't know if it would be possible to detect you're using the wrong OS's goon, but it would be helpful.

[whitfin]

This is more of a general issue. If I use amd64 version of Goon, I get the same error message - but go version reports that I'm on darwin/amd64. If I use the 386 one it then works.

Clearly nothing to do with protocol versioning, the error message just need improving here rather than being hardcoded to that.