I attempted to use this plugin with the Pipeline (previously called Workflow) plugin and, although you can configure the plugin parameters on the job page, saving the job configuration fails with the following error:

javax.servlet.ServletException: java.lang.ClassCastException: org.jenkinsci.plugins.workflow.job.WorkflowJob cannot be cast to hudson.model.AbstractProject
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)

It would be great to add support for the Pipeline plugin so pipeline builds can be triggered when Pull Requests are created and / or approved.