Add build badge to readme

README.adoc

@@ -5,6 +5,7 @@
 :project-name:  bootstrapfx-core
 :project-group: org.kordamp.bootstrapfx
 
+image:http://img.shields.io/travis/aalmiray/{project-name}/master.svg["Build Status (travis)", link="https://travis-ci.org/aalmiray/{project-name}"]
 image:http://img.shields.io/badge/license-MIT-blue.svg["MIT Licensed", link="http://opensource.org/licenses/MIT"]
 image:https://api.bintray.com/packages/{project-owner}/{project-repo}/{project-name}/images/download.svg[link="https://bintray.com/{project-owner}/{project-repo}/{project-name}/_latestVersion"]
 image:https://img.shields.io/maven-central/v/{project-group}/{project-name}.svg?label=maven[link="https://search.maven.org/#search|ga|1|{project-group}"]