Update README.md

Author: beheh

README.md

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 # hslog
 
-[![Build Status](https://travis-ci.com/HearthSim/python-hslog.svg?branch=master)](https://travis-ci.com/HearthSim/python-hslog)
+[![GitHub Workflow Status (branch)](https://img.shields.io/github/workflow/status/HearthSim/python-hslog/CI/master)](https://github.com/HearthSim/python-hslog/actions/workflows/ci.yml)
 [![PyPI](https://img.shields.io/pypi/v/hslog.svg)](https://pypi.org/project/hslog/)
 
 hslog is a powerful Hearthstone Power.log deserializer.