publish method is not working as expected

`def publish(self,address,body,deliveryOption=None)`
publish is working as a send because message json is having type as send, it should be publish

Current code is
`message=json.dumps({'type':'send','address':address,'headers':headers,'body':body,})`

Changed code would be
`message=json.dumps({'type':'publish','address':address,'headers':headers,'body':body,})`
