update readme badge

Author: kyoungho

README.md

@@ -3,7 +3,7 @@
 [![GoDoc](https://img.shields.io/badge/doc-reference-00ADD8.svg?logo=go)](https://godoc.org/github.com/influxdata/telegraf)
 [![Docker pulls](https://img.shields.io/docker/pulls/library/telegraf.svg)](https://hub.docker.com/_/telegraf/)
 [![Go Report Card](https://goreportcard.com/badge/github.com/influxdata/telegraf)](https://goreportcard.com/report/github.com/influxdata/telegraf)
-[![Circle CI](https://circleci.com/gh/influxdata/telegraf.svg?style=svg)](https://circleci.com/gh/influxdata/telegraf)
+[![Build](https://github.com/rticommunity/telegraf/workflows/CI/CD/badge.svg)](https://github.com/rticommunity/telegraf/actions)
 
 Telegraf is an agent for collecting, processing, aggregating, and writing
 metrics, logs, and other arbitrary data.