Upgrade project's 'Development Status' to '5 - Production/Stable'.

Author: Davi0kProgramsThings

setup.py

@@ -16,7 +16,7 @@
     author_email="support@bitfinex.com",
     license="Apache-2.0",
     classifiers=[
-        "Development Status :: 4 - Beta",
+        "Development Status :: 5 - Production/Stable",
         "Intended Audience :: Developers",
         "Topic :: Software Development :: Build Tools",
         "License :: OSI Approved :: Apache Software License",