Merge pull request #36 from fluent-plugins-nursery/badge

docs: update CI badges

Author: kenhys

README.md

@@ -1,6 +1,8 @@
 # Fluent::Plugin::Irc, a plugin for [Fluentd](http://fluentd.org)
 
-[![Build Status](https://travis-ci.org/fluent-plugins-nursery/fluent-plugin-irc.svg?branch=master)](https://travis-ci.org/fluent-plugins-nursery/fluent-plugin-irc)
+[![Testing on macOS](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/macos.yml/badge.svg)](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/macos.yml)
+[![Testing on Ubuntu](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/linux.yml/badge.svg)](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/linux.yml)
+[![Testing on Windows](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/windows.yml/badge.svg)](https://github.com/fluent-plugins-nursery/fluent-plugin-irc/actions/workflows/windows.yml)
 
 Fluent plugin to send messages to IRC server