chore: improve package classifiers

Author: jenstroeger

pyproject.toml

@@ -37,10 +37,21 @@ license = "MIT"
 keywords = ["commitizen", "conventional", "commits", "git"]
 readme = "docs/README.md"
 homepage = "https://github.com/commitizen-tools/commitizen"
+# See also: https://pypi.org/classifiers/
 classifiers = [
+    "Development Status :: 5 - Production/Stable",
+    "Environment :: Console",
+    "Intended Audience :: Developers",
     "License :: OSI Approved :: MIT License",
+    "Natural Language :: English",
+    "Operating System :: OS Independent",
+    "Programming Language :: Python",
+    "Programming Language :: Python :: 3",
     "Programming Language :: Python :: 3.6",
     "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: Implementation :: CPython",
 ]