Update README.md

Author: piotrpekala7

README.md

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 # gns3-web-ui
 
-[![Travis CI](https://api.travis-ci.org/GNS3/gns3-web-ui.svg?branch=master)](https://travis-ci.org)
-[![AppVeyor](https://ci.appveyor.com/api/projects/status/github/GNS3/gns3-web-ui?branch=master&svg=true)](https://www.appveyor.com/)
-[![CircleCI](https://circleci.com/gh/GNS3/gns3-web-ui/tree/master.png)](https://circleci.com/gh/GNS3/gns3-web-ui/tree/master.png)
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+![Build](https://github.com/GNS3/gns3-web-ui/actions/workflows/main.yml/badge.svg)
 [![Dependency](https://img.shields.io/librariesio/github/GNS3/gns3-web-ui)](https://libraries.io/github/GNS3/gns3-web-ui)
 [![Packages versions](https://repology.org/badge/latest-versions/gns3.svg)](https://repology.org/metapackage/gns3/versions)
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 ## Demo
 
 Please use GNS3 WebUI bundled in `gns3server` and `gns3`.