Remove pytest runner (#11)

Setup scripts can use pytest-runner to add setup.py test support for pytest runner.

Author: WilliamBergamin

pyproject.toml

@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools", "pytest-runner"]
+requires = ["setuptools"]
 build-backend = "setuptools.build_meta"
 
 [project]