message: docs: fix build status badge to github actions
diff: @@ -22,7 +22,7 @@ Superset
  [![License](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
  ![GitHub release (latest SemVer)](https://img.shields.io/github/v/release/apache/incubator-superset)
  -[![Build Status](https://travis-ci.org/apache/incubator-superset.svg?branch=master)](https://travis-ci.org/apache/incubator-superset)
  +[![Build Status](https://github.com/apache/incubator-superset/workflows/Python/badge.svg)](https://github.com/apache/incubator-superset/actions)
  [![PyPI version](https://badge.fury.io/py/apache-superset.svg)](https://badge.fury.io/py/apache-superset)
  [![Coverage Status](https://codecov.io/github/apache/incubator-superset/coverage.svg?branch=master)](https://codecov.io/github/apache/incubator-superset)
  [![PyPI](https://img.shields.io/pypi/pyversions/apache-superset.svg?maxAge=2592000)](https://pypi.python.org/pypi/apache-superset)
  