delivery_count property for service bus (#544)

Author: maiqbal11

setup.py

@@ -249,7 +249,7 @@ def run(self):
     ],
     extras_require={
         'dev': [
-            'azure-functions==1.0.3',
+            'azure-functions==1.0.4',
             'flake8~=3.5.0',
             'mypy',
             'pytest',

tests/endtoend/servicebus_functions/servicebus_trigger/__init__.py

@@ -8,6 +8,7 @@ def main(msg: azf.ServiceBusMessage) -> str:
         'message_id': msg.message_id,
         'body': msg.get_body().decode('utf-8'),
         'content_type': msg.content_type,
+        'delivery_count': msg.delivery_count,
         'expiration_time': msg.expiration_time,
         'label': msg.label,
         'partition_key': msg.partition_key,