Update pyproject: better tags, drop old versions, require python properly

Author: Michael-E-Rose

pyproject.toml

@@ -20,20 +20,18 @@ classifiers = [
     "License :: OSI Approved :: MIT License",
     "Programming Language :: Python",
     "Natural Language :: English",
+    "Topic :: Documentation :: Sphinx"
     "Topic :: Software Development",
     "Topic :: Software Development :: Libraries :: Python Modules",
     "Topic :: Scientific/Engineering",
     "Topic :: Scientific/Engineering :: Information Analysis",
-    "Operating System :: Microsoft :: Windows",
-    "Operating System :: Unix",
-    "Operating System :: MacOS",
-    "Programming Language :: Python :: 3.6",
-    "Programming Language :: Python :: 3.7",
-    "Programming Language :: Python :: 3.8",
+    "Operating System :: OS Independent",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
-    "Programming Language :: Python :: 3.11"
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12"
 ]
+requires-python = ">=3.9,<=3.13"
 keywords = [
     "Python",
     "MEDLINE",