build: Add a long_descriptino which is now a required field.

Previously it could be empty but now PyPI throws an error when you try
to publish with an empty long description.

Fix that, and bump the version.  We're also updating the django
classifiers to be more accurate.

opaque_keys/__init__.py

@@ -14,7 +14,7 @@
 from stevedore.enabled import EnabledExtensionManager
 from typing_extensions import Self  # For python 3.11 plus, can just use "from typing import Self"
 
-__version__ = '2.7.0'
+__version__ = '2.8.0'
 
 
 class InvalidKeyError(Exception):

setup.py

@@ -4,6 +4,7 @@
 """
 import os
 import re
+from pathlib import Path
 
 from setuptools import find_packages, setup
 
@@ -90,9 +91,15 @@ def get_version(*file_paths):
 
 VERSION = get_version("opaque_keys", "__init__.py")
 
+# read the contents of your README file
+this_directory = Path(__file__).parent
+long_description = (this_directory / "README.rst").read_text()
+
 
 setup(
     name='edx-opaque-keys',
+    long_description=long_description,
+    long_description_content_type='text/x-rst',
     version=VERSION,
     author='edX',
     url='https://github.com/openedx/opaque-keys',
@@ -105,8 +112,7 @@ def get_version(*file_paths):
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",
         "Framework :: Django",
-        "Framework :: Django :: 3.2",
-        "Framework :: Django :: 4.0",
+        "Framework :: Django :: 4.2",
     ],
     # We are including the tests because other libraries do use mixins from them.
     packages=find_packages(),