Fixed a bug in compiling..

Works as expected for now:
  output {
    if [latency] > 0.5 {
      pagerduty {
        description => "Oh snap!"
      }
    }
  }

Result:
  if ((event["[latency]"] > 0.5))
    plugin("output", "pagerduty", "description" => "Oh snap!")
  end