rocketmq-client-python which using pip install has no ConsumeStatus

1. Please describe the issue you observed:
rocketmq-client-python which using pip install has no ConsumeStatus Class

2. Please tell us about your environment:
mac os

3. Other information (e.g. detailed explanation, logs, related issues, suggestions on how to fix, etc):
I follow the README.md file, using 'pip install rocketmq-client-python' command to install the package. When I finish, I find that I cannot import ConsumeStatus Class. Then I download the source code from github, using python setup.py to install. It works. But Why???