MAINT: update pypi classifiers (#1153)

Fix #1106

Author: 12rambau

pyproject.toml

@@ -34,8 +34,13 @@ maintainers = [
 ]
 
 classifiers = [
-  "Development Status :: 4 - Beta",
+  "Development Status :: 5 - Production/Stable",
   "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
   "Framework :: Sphinx",
   "Framework :: Sphinx :: Theme",
   "License :: OSI Approved :: BSD License",