README: update badges

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-# ttyd - Share your terminal over the web [![Build Status](https://travis-ci.org/tsl0922/ttyd.svg?branch=master)](https://travis-ci.org/tsl0922/ttyd) [![Greenkeeper badge](https://badges.greenkeeper.io/tsl0922/ttyd.svg)](https://greenkeeper.io/)
+# ttyd - Share your terminal over the web [![](https://github.com/tsl0922/ttyd/workflows/frontend/badge.svg)](https://github.com/tsl0922/ttyd/actions?workflow=frontend) [![](https://github.com/tsl0922/ttyd/workflows/backend/badge.svg)](https://github.com/tsl0922/ttyd/actions?workflow=backend)
 
 ttyd is a simple command-line tool for sharing terminal over the web, inspired by [GoTTY][1].