Switch to setup.cfg and pytproject.toml

For further information see PEP517/518

pyproject.toml

+[build-system]
+requires = ["setuptools>=42", "wheel"]   # PEP 508 specifications.
+build-backend = "setuptools.build_meta"

setup.cfg

+[metadata]
+name = moist_thermodynamics
+version = 0.5.0
+description = Constants and functions for the treatment of moist atmospheric thermodynamics.
+long_description = file: README.md
+license = BSD 3-Clause License
+
+[options]
+packages = find:
+install_requires =
+    numpy
+    scipy

setup.py

-# content of setup.py
-from setuptools import setup, find_packages
+from setuptools import setup
 
-setup(
-    name="moist_thermodynamics",
-    version="0.5",
-    description="Constants and functions for the treatment of moist atmospheric thermodynamics",
-    packages=find_packages(),
-    install_requires=[
-        "numpy",
-        "scipy",
-    ],
-)
+
+setup()