Fix CI badge

Author: Tomás Senart

README.md

@@ -1,4 +1,4 @@
-# Vegeta [![Build Status](https://github.com/tsenart/vegeta/workflows/ci/badge.svg)](https://github.com/tsenart/vegeta/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/tsenart/vegeta)](https://goreportcard.com/report/github.com/tsenart/vegeta) [![GoDoc](https://godoc.org/github.com/tsenart/vegeta?status.svg)](https://godoc.org/github.com/tsenart/vegeta) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/tsenart/vegeta?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Donate](https://img.shields.io/badge/donate-bitcoin-yellow.svg)](#donate)
+# Vegeta [![Build Status](https://github.com/tsenart/vegeta/workflows/CI/badge.svg)](https://github.com/tsenart/vegeta/actions) [![Go Report Card](https://goreportcard.com/badge/github.com/tsenart/vegeta)](https://goreportcard.com/report/github.com/tsenart/vegeta) [![GoDoc](https://godoc.org/github.com/tsenart/vegeta?status.svg)](https://godoc.org/github.com/tsenart/vegeta) [![Gitter](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/tsenart/vegeta?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge) [![Donate](https://img.shields.io/badge/donate-bitcoin-yellow.svg)](#donate)
 
 Vegeta is a versatile HTTP load testing tool built out of a need to drill
 HTTP services with a constant request rate.