#120 Fix test.assertHelp for commands with long help

[Valentin Lorentz]

Hi,

I have no idea how, but it seemed to be broken.

https://github.com/ProgVal/Limnoria/commit/5f94da866062138288742792f157bebd93389c3b
https://github.com/ProgVal/Limnoria/commit/19708c55cc6e4d4e3166c0c96727ab2683e833c6

Regards,
Valentin