Modoboa installer does not support version selection

[CyberfoxDK]

According to documentation, it should be possible to select the version to be installed.
$ sudo ./run.py --version=X.X.X

When doing so, i get the following error.

@mail:~/modoboa-installer$ sudo ./run.py --version=1.13
usage: run.py [-h] [--debug] [--force] [--configfile CONFIGFILE]
[--version {latest,1.9.0,1.8.1,1.8.2,1.8.3}]
[--stop-after-configfile-check] [--interactive] [--upgrade]
domain
run.py: error: argument --version: invalid choice: '1.13' (choose from 'latest', '1.9.0', '1.8.1', '1.8.2', '1.8.3')

(This it not critical - just an observation... AND THANK YOU for modoboa .- its great ! )