no method or property "customOut" on *pipeline.QueryNode

**OS**: 64-bit Ubuntu
**Kapactior Version**: 1.3
**Code (.tick)**:

```
batch
|query('select last(value) from specific_measurement')
|customOut()
```

I've followed the examples on https://docs.influxdata.com/kapacitor/v1.5/working/custom_output/ with Kapacitor version 1.3 to create a custom output node.

The error I'm getting when wanting to define the task is: no method or property "customOut" on *pipeline.QueryNode

Any ideas?

Compare the Kapacitor 1.5 custom output documentation with the reported Kapacitor 1.3 behavior, starting from the .tick pipeline's query('select last(value) from specific_measurement') and customOut() calls. Confirm whether the documented method is available in version 1.3 and document or correct the version-specific guidance so the reported task can be defined successfully.

Written by the indexing model from the issue text.