Add support for pyproject.toml.

[sanjioh]

Fixes #71

[gforcada]

@sanjioh thanks for your contribution, it is finally released as flake8-isort 2.8.0 🎉

[uyar]

@gforcada @sanjioh This doesn't seem to be included in flake8-isort 2.8.0. There is no mention of pyproject.toml in the code. The commit only changes the run_test and setup modules, and not the flake8_isort module. Am I missing something?

[gforcada]

@uyar I thought so myself when I first tried this pull request locally, but (un)fortunately isort, as soon as there is toml available, it uses the pyproject.toml configuration if it is available.

It is good in a way, because without us here in flake8-isort doing anything it already works, but it makes all the configuration searching a bit pointless as isort, despite whatever you give as configuration, still looks for it on its own.

Or at least that's how I understood it, which can be totally wrong 😅

[uyar]

@gforcada But it didn't work in my environment although toml was available. It failed due to configuration being missing and without calling isort. As least I think that's what happened. I'll check it out tomorrow and get back to you.

[uyar]

I think the comment by @mikewl on the closed issue #71 is correct.

EDIT: I was writing on my phone, so I couldn't include the author who posted the comment. Fixed that now.

[gforcada]

@uyar thanks for pointing that out, that comment somehow slipped through the cracks and I missed it 😓