Update badges to new branch main.

Author: uhafner

README.adoc

@@ -3,8 +3,8 @@
 
 = Bootstrap 5 Jenkins Plugin
 
-image:https://ci.jenkins.io/job/Plugins/job/bootstrap5-api-plugin/job/master/badge/icon?subject=Jenkins%20CI[Jenkins, link=https://ci.jenkins.io/job/Plugins/job/bootstrap5-api-plugin/job/master/]
-image:https://github.com/jenkinsci/bootstrap5-api-plugin/workflows/GitHub%20CI/badge.svg?branch=master[GitHub Actions, link=https://github.com/jenkinsci/bootstrap5-api-plugin/actions]
+image:https://ci.jenkins.io/job/Plugins/job/bootstrap5-api-plugin/job/main/badge/icon?subject=Jenkins%20CI[Jenkins, link=https://ci.jenkins.io/job/Plugins/job/bootstrap5-api-plugin/job/main/]
+image:https://github.com/jenkinsci/bootstrap5-api-plugin/workflows/GitHub%20CI/badge.svg?branch=main[GitHub Actions, link=https://github.com/jenkinsci/bootstrap5-api-plugin/actions]
 image:https://img.shields.io/github/issues-pr/jenkinsci/bootstrap5-api-plugin.svg[GitHub pull requests, link=https://github.com/jenkinsci/bootstrap5-api-plugin/pulls]
 
 Provides https://getbootstrap.com/[Bootstrap 5] for Jenkins Plugins. Bootstrap is -- according to their self-perception --