fix development status classifier

Author: jreiberkyle

setup.py

@@ -51,7 +51,7 @@
     long_description=Path("README.md").read_text("utf-8"),
     long_description_content_type="text/markdown",
     classifiers=[
-        'Development Status :: 5 - Production',
+        'Development Status :: 5 - Production/Stable',
         'Environment :: Console',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',