Update Build Status Badge (#589)

Author: ohbus

README.md

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 # Zero Allocation JSON Logger
 
-[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/zerolog) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/zerolog/master/LICENSE) [![Build Status](https://travis-ci.org/rs/zerolog.svg?branch=master)](https://travis-ci.org/rs/zerolog) [![Go Coverage](https://github.com/rs/zerolog/wiki/coverage.svg)](https://raw.githack.com/wiki/rs/zerolog/coverage.html)
+[![godoc](http://img.shields.io/badge/godoc-reference-blue.svg?style=flat)](https://godoc.org/github.com/rs/zerolog) [![license](http://img.shields.io/badge/license-MIT-red.svg?style=flat)](https://raw.githubusercontent.com/rs/zerolog/master/LICENSE) [![Build Status](https://github.com/rs/zerolog/actions/workflows/test.yml/badge.svg)](https://github.com/rs/zerolog/actions/workflows/test.yml) [![Go Coverage](https://github.com/rs/zerolog/wiki/coverage.svg)](https://raw.githack.com/wiki/rs/zerolog/coverage.html)
 
 The zerolog package provides a fast and simple logger dedicated to JSON output.