improve package metadata

* use README.rst as long description
* add link to documentation
* move setup.cfg metadata into pyproject.toml

README.rst

@@ -8,7 +8,9 @@ pyglpk
     :target: http://pyglpk.readthedocs.io/en/latest/?badge=latest
     :alt: Documentation Status
 
-Fork of T. Finley's PyGLPK module, available through `pip install glpk`
+Fork of T. Finley's PyGLPK module, available through ``pip install glpk``.
+
+You can find the documentation on https://pyglpk.readthedocs.io/
 
 Overview
 --------

pyproject.toml

@@ -1,4 +1,43 @@
 [build-system]
 requires = ["setuptools>=30.3.0", "wheel", "setuptools_scm"]
 
+[project]
+name = "glpk"
+description = "PyGLPK, a Python module encapsulating GLPK"
+dynamic = ["version"]
+
+authors = [{ name = "Thomas Finley", email = "[email protected]"}]
+
+maintainers = [
+  {name = "Bradford D. Boyle", email = "[email protected]"}
+]
+license = {text = "GPL-3.0"}
+readme = "README.rst"
+keywords = ["glpk", "optimization"]
+
+classifiers=[
+    "Development Status :: 3 - Alpha",
+    "Intended Audience :: Science/Research",
+    "Programming Language :: C",
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+    "Operating System :: POSIX",
+    "Operating System :: MacOS :: MacOS X",
+    "Topic :: Scientific/Engineering :: Mathematics",
+    "Topic :: Software Development :: Libraries :: Python Modules",
+
+]
+requires-python = ">=3"
+
+[project.urls]
+Homepage = "https://github.com/bradfordboyle/pyglpk"
+Repository = "https://github.com/bradfordboyle/pyglpk"
+Documentation = "https://pyglpk.readthedocs.io/"
+Issues = "https://github.com/bradfordboyle/pyglpk/issues"
+
+
 [tool.setuptools_scm]

tox.ini

@@ -1,6 +1,6 @@
 # content of: tox.ini , put in same dir as setup.py
 [tox]
-envlist = py27,py36,py37
+envlist = py39,py310,py311,py312
 
 [testenv]
 deps =