[package] Add pyproject.toml

This follows bob packages new standard

[package] Add pyproject.toml
e31e60ae · Samuel GAIST · 14ab5074 · e31e60ae
Commit e31e60ae authored 4 years ago by Samuel GAIST
--- a/pyproject.toml
+++ b/pyproject.toml
+[build-system]
+requires = ["setuptools", "wheel"]
+build-backend = "setuptools.build_meta"