switch out setuptools for poetry

setup.py is the very old style for packaging, so I wanted to replace it
with something more "modern". pyproject.toml seems like the way to go in
the future.

At first, I wanted to simply configure setuptools using pyproject.toml,
but that support is in beta and seemed to cause some issues with the tox
virtualenvs.

Poetry seems to work fine and provides a better dependency resolver
(given that dependencies are actually specified well) and some other
goodies. For users, nothing much should change, as "pip install" still
works.

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 91cda20..66e9870 100644
--- a/tox.ini
+++ b/tox.ini
@@ -6,6 +6,7 @@ per-file-ignores =
 
 [tox]
 envlist = python,pylint,pylint-tests,flake8
+isolated_build = true
 
 [testenv]
 deps =