Clean up badges

Signed-off-by: Richard Steinmetz <richard@steinmetz.cloud>

README.md

@@ -1,10 +1,8 @@
 # Nextcloud Mail
 
 ![Downloads](https://img.shields.io/github/downloads/nextcloud/mail/total.svg)
-[![Build Status](https://travis-ci.org/nextcloud/mail.svg?branch=master)](https://travis-ci.org/nextcloud/mail)
-[![Scrutinizer Code Quality](https://scrutinizer-ci.com/g/nextcloud/mail/badges/quality-score.png?b=master)](https://scrutinizer-ci.com/g/nextcloud/mail/?branch=master)
-[![PHP Coverage](https://scrutinizer-ci.com/g/nextcloud/mail/badges/coverage.png?b=master)](https://scrutinizer-ci.com/g/nextcloud/mail/?branch=master)
-[![JavaScript Coverage](https://coveralls.io/repos/github/nextcloud/mail/badge.svg)](https://coveralls.io/github/nextcloud/mail)
+![GitHub Workflow Status](https://img.shields.io/github/workflow/status/nextcloud/mail/Test)
+[![Codecov](https://img.shields.io/codecov/c/github/nextcloud/mail)](https://codecov.io/gh/nextcloud/mail)
 [![Dependabot Status](https://api.dependabot.com/badges/status?host=github&repo=nextcloud/mail)](https://dependabot.com)
 
 **💌 A mail app for [Nextcloud](https://nextcloud.com)**