Display Heroku process `name.num` as worker host?

e.g. at top of result, instead of:

```
output
starting job {aa6e7b96f643902f4f549e73ef09c7036c347229 / test}
worker host 8de16de3-3736-4d07-be7a-a4c247b2695c
```

```
output
starting job {aa6e7b96f643902f4f549e73ef09c7036c347229 / test}
worker host worker.1
```