Update PyPI classifiers

See: #110

Author: kytta

setup.cfg

@@ -11,6 +11,7 @@ classifiers =
     Framework :: Django
     Framework :: Django :: 3.2
     Framework :: Django :: 4.0
+    Framework :: Django :: 4.1
     Intended Audience :: Developers
     License :: OSI Approved :: BSD License
     Natural Language :: English
@@ -25,6 +26,7 @@ classifiers =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
 
 [options]
 packages =