TST: Update test matrix

[pllim]

It is chronically failing and Python 3.3 is rather old by now.

[jakirkham]

I think it is also unsupported. Is someone able to review this PR?

[cclauss]

3.4 is EOL now too.

[cclauss]

Also see #162

[pllim]

Hah, @cclauss , looks like we are duplicating each other. I just updated this PR too. Anyway, I'll let the maintainers decide. I was just trying to help on the side and not really involved with this project.

[cclauss]

Same. It was a dependency on a project so I jumped in to see what the real story was. If you want to cherrypick the 3.7 and 3.8-dev stuff out of #162 and put them into this PR then I will gladly close #162.

[pllim]

@cclauss , I think in a way I already did, except that I am not allowing 3.7 to fail.

[pllim]

p.s. Yikes, it just failed, so maybe I'll have to.

[cclauss]

The problem is that very few maintainers pay a lot of attention or merge PRs that have failing tests. ;-)

[cclauss]

#153 or similar is required to be compatible with Python 3.7.

[pllim]

p.s. As far as your dependency tree is concerned, given that this PR has been open for 4 months, you might want to be in contact with the maintainers or maybe have someone from your company to volunteer to co-maintain this. Just a thought.