Remove old chat service and add action's badge

README.md

@@ -9,8 +9,7 @@
 <p align="center">
   <a href="#backers" title="Backers on Open Collective"><img src="https://opencollective.com/ngx_mruby/backers/badge.svg"></a>
   <a href="#sponsors" title="Sponsors on Open Collective"><img src="https://opencollective.com/ngx_mruby/sponsors/badge.svg"></a>
-  <a href="https://travis-ci.org/matsumotory/ngx_mruby" title="Build Status"><img src="https://travis-ci.org/matsumotory/ngx_mruby.svg?branch=master"></a>
-  <a href="https://gitter.im/matsumoto-r/ngx_mruby?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge" title="Gitter"><img src="https://badges.gitter.im/Join%20Chat.svg"></a>
+  <a href="https://github.com/matsumotory/ngx_mruby/actions" title="Build Status"><img src="https://github.com/matsumotory/ngx_mruby/actions/workflows/test.yml/badge.svg?branch=master"></a>
 </p>
 
 ## Documents