Set development status to Production/Stable

Author: lavr

setup.py

@@ -131,7 +131,7 @@ def find_version(*file_paths):
     },
     zip_safe=False,
     classifiers=(
-        'Development Status :: 4 - Beta',
+        'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',
         'Natural Language :: English',
         "Operating System :: OS Independent",