mark package as stable in metadata (#174)

fixes #165

Author: Bierbarbar

setup.py

@@ -34,7 +34,7 @@ def get_install_requires():
     include_package_data=True,
     license="MIT",
     classifiers=(
-        "Development Status :: 4 - Beta",
+        "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python :: 2",