Update Development Status

Author: saghul

setup.py

@@ -39,7 +39,7 @@ def get_version():
       packages         = ['fibers'],
       platforms        = ["POSIX", "Microsoft Windows"],
       classifiers      = [
-          "Development Status :: 4 - Beta",
+          "Development Status :: 5 - Production/Stable",
           "Intended Audience :: Developers",
           "License :: OSI Approved :: MIT License",
           "Operating System :: POSIX",