title: Jenkins pipelineTriggers option crashes
body: <p>Trying to use a cron-triggered build in a Jenkins declarative pipeline script:</p>
  
  <pre><code>options
  {
      disableConcurrentBuilds()
      timeout(time: 1, unit: 'HOURS')
      buildDiscarder(logRotator(numToKeepStr: '5'))
      pipelineTriggers([cron('H 0 * * *')])
  }
  </code></pre>
  
  <p>When run, throws this Exception:</p>
  
  <pre><code>org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
  WorkflowScript: 30: Invalid option type "pipelineTriggers". Valid option types: [buildDiscarder, catchError, disableConcurrentBuilds, overrideIndexTriggers, retry, script, skipDefaultCheckout, skipStagesAfterUnstable, timeout, timestamps, waitUntil, withContext, withCredentials, withEnv, ws] @ line 30, column 3.
          pipelineTriggers([cron('H 0 * * *')])
       ^
  
  1 error
  
      at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:310)
      at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1085)
      at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:603)
      at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:581)
      at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:558)
      at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:298)
      at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:268)
      at groovy.lang.GroovyShell.parseClass(GroovyShell.java:688)
      at groovy.lang.GroovyShell.parse(GroovyShell.java:700)
      at org.jenkinsci.plugins.workflow.cps.CpsGroovyShell.reparse(CpsGroovyShell.java:67)
      at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.parseScript(CpsFlowExecution.java:430)
      at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution.start(CpsFlowExecution.java:393)
      at org.jenkinsci.plugins.workflow.job.WorkflowRun.run(WorkflowRun.java:238)
      at hudson.model.ResourceController.execute(ResourceController.java:97)
      at hudson.model.Executor.run(Executor.java:405)
  Finished: FAILURE
  </code></pre>
  
  <p>Anyone know the correct syntax or a workaround for a cron trigger in pipeline script?</p>