formatting

pyproject.toml

@@ -1,5 +1,12 @@
+
 [build-system]
-requires = ["setuptools >=39.2.0", "setuptools_scm >= 4.1.2", "wheel >= 0.35.1"]
+# Preparing for PEP-517/PEP-518, but not in effect yet.
+# These requires are not effective yet, setup.cfg is.
+requires =[
+        "setuptools >=39.2.0",
+        "setuptools_scm >= 4.1.2",
+        "wheel >= 0.35.1" ]
+
 build-backend = "setuptools.build_meta"
 
 [tool.pytest.ini_options]