Remove Travis badge from README

Author: emlun

README

@@ -4,7 +4,6 @@ java-webauthn-server
 :toc-placement: macro
 :toc-title:
 
-image:https://travis-ci.org/Yubico/java-webauthn-server.svg?branch=master["Build Status", link="https://travis-ci.org/Yubico/java-webauthn-server"]
 image:https://github.com/Yubico/java-webauthn-server/workflows/build/badge.svg["Build Status", link="https://github.com/Yubico/java-webauthn-server/actions"]
 image:https://coveralls.io/repos/github/Yubico/java-webauthn-server/badge.svg["Coverage Status", link="https://coveralls.io/github/Yubico/java-webauthn-server"]