title: Jenkins cucumber reports plugin buildStaus has no affect
body: <p>I coudn't get the  build status change to UNSTABLE in jenkins. seems cucumber buildStatus has no affect ?
  or it would be helpful to know what i am doing wrong ?  </p>
  
  <pre><code>post {
      always {
          cucumber buildStatus: 'UNSTABLE',
                  failedFeaturesNumber: 1,
                  failedScenariosNumber: 1,
                  skippedStepsNumber: 1,
                  failedStepsNumber: 1,
                  fileIncludePattern: '**/*cucumber-report.json',
                  trendsLimit: 10
      }
  </code></pre>
  
  <p>}</p>