docs:replace travis status icon with github action

Author: weakish

README.md

@@ -1,6 +1,8 @@
 # Python-SDK
 
-[![Build Status](https://travis-ci.org/leancloud/python-sdk.svg?branch=master)](https://travis-ci.org/leancloud/python-sdk) [![Python3 Support](https://caniusepython3.com/project/leancloud-sdk.svg)](https://caniusepython3.com/project/leancloud-sdk) [![Codecov](https://img.shields.io/codecov/c/github/leancloud/python-sdk.svg)](https://codecov.io/gh/leancloud/python-sdk)
+![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/leancloud/python-sdk/Python%20package/master)
+[![Python3 Support](https://caniusepython3.com/project/leancloud-sdk.svg)](https://caniusepython3.com/project/leancloud-sdk)
+[![Codecov](https://img.shields.io/codecov/c/github/leancloud/python-sdk.svg)](https://codecov.io/gh/leancloud/python-sdk)
 
 LeanCloud Python SDK