Make 3.11 support explicit

Author: DanielNoord

setup.cfg

@@ -20,6 +20,7 @@ classifiers =
     Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.11
     Programming Language :: Python :: Implementation :: CPython
     Topic :: Software Development :: Quality Assurance
 keywords = python docstring format
@@ -32,7 +33,7 @@ project_urls =
 python_requires = >=3.8
 packages = find:
 install_requires =
-    tomli >= 1.1.0
+    tomli>=1.1.0;python_version<"3.11"
 
 [options.packages.find]
 include =