Update Development Status to "4 - Beta"

Author: YijunXieMS

sdk/eventhub/azure-eventhub/setup.py

@@ -54,7 +54,7 @@
     author_email='[email protected]',
     url='https://github.com/Azure/azure-sdk-for-python/tree/master/sdk/eventhub/azure-eventhub',
     classifiers=[
-        "Development Status :: 5 - Production/Stable",
+        "Development Status :: 4 - Beta",
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',