fix classifier

Author: irmen

setup.cfg

@@ -11,7 +11,7 @@ keywords = distributed objects, RPC, remote method call, IPC
 license = MIT
 license_file = LICENSE
 classifiers =
-    Development Status :: 5 - Production/Stable,
+    Development Status :: 5 - Production/Stable
     Intended Audience :: Developers
     License :: OSI Approved :: MIT License
     Natural Language :: English