Add pyproject.toml, to follow PEP 518

Keep manual setuptools detection on setup.py for people using pip < 10.0.0

Add pyproject.toml, to follow PEP 518
97c6ff8b · Javier Jardón · 1e3e2a93 · 97c6ff8b
Commit 97c6ff8b authored 6 years ago by Javier Jardón
--- a/pyproject.toml
+++ b/pyproject.toml
+[build-system]
+requires = ["setuptools", "wheel"]