Oh it seems travis-ci do not support python 3.6, but I checked with docs, it tells me to add 'nightly' which points to '3.6-dev', should I add that ?

Fixes #364

Oh, sweet!

Should we allow the build to fail against nightly, @behrtam? Or merge as is, and if it becomes a problem we can adjust it.

Python 3.6 is still in beta. I expect that @behrtam wanted to add it once it is actually released rather than pointing at nightly, which is Pythons active development branch.

Using that is very different from adding a new version of Python to test against.

I mixed up the release of the beta 1 (the end of the feature development phase) with the actual final version. But adding the nightly to know where we stand does sound like a good idea.

matrix:
    allow_failures:
        - python: "nightly"

should I sent new patch or this is going to be closed :( ?

You can just update this PR.