[pdal] Unexpected argument out_srs

[Pol Monsó Purtí]

Hello everyone,

I'm just gettings started with PDAL and I wanted to try setting the SRS of
a las following the example [here](https://www.pdal.io/tutorial/las.html)

I'm on Ubuntu 14.04, using pdal 1.5 installed with docker.

pdal info does work, but when I run the example pipeline, I get the
following error:

```
$ docker run -v /home/user/data:/data pdal/pdal:1.5 pdal pipeline
/data/setproj.json
PDAL: writers.las: Unexpected argument 'out_srs'.
```

Is there something additional I have to install so that `writers.las`
understand the `out_srs` tag?
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