Change CI being on it's own line in readme

Looks better this way IMO

README.md

@@ -5,7 +5,6 @@
 # Puma: A Ruby Web Server Built For Concurrency
 
 [![Actions Build Status](https://github.com/puma/puma/workflows/CI/badge.svg?branch=master)](https://github.com/puma/puma/actions)
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 [![Code Climate](https://codeclimate.com/github/puma/puma.svg)](https://codeclimate.com/github/puma/puma)
 [![SemVer](https://api.dependabot.com/badges/compatibility_score?dependency-name=puma&package-manager=bundler&version-scheme=semver)](https://dependabot.com/compatibility-score.html?dependency-name=puma&package-manager=bundler&version-scheme=semver)
 [![StackOverflow](https://img.shields.io/badge/stackoverflow-Puma-blue.svg)]( https://stackoverflow.com/questions/tagged/puma )